- Choice Modeling (CM)
- Contingent Valuation
Method (CVM)
The revealed preference method utilizes observed behavior among the individuals that has already occurred and makes use of this to approximate suggested willingness to pay for a change in mortality risk. This method has an advantage over the stated preference approach in that if a person pays a certain amount for a commodity, it is known with conviction that the same person’s WTP for that commodity is at least the amount he/she is willing to pay. The four methods used to reveal preferences include: (a) the hedonic pricing method; (b) the travel cost method; (c) the cost of illness approach; (d) the replacement cost method [ 14 , 15 , 16 ].
In contrast with revealed preference methods, the stated preferences method creates a hypothetical market in a survey. It parallels a market survey and estimates a willingness to pay for hypothetical reduction in mortality risks, since it resembles market behavior. In addition, stated preference methods incorporate both active and passive use of a commodity by the consumer. Direct or active values arise when an individual physically experiences the commodity, while passive or indirect values entail that an individual does not directly experience the commodity. The three methods used for stated preferences include: (a) the contingent valuation method; (b) the choice modeling method; (c) life satisfaction analysis [ 17 , 18 , 19 ].
Non-behavioral methods are not necessarily based on human choices and cognitive biases which affect the choices subconsciously. They include the human capital method (HCM) [ 20 ] and life quality index method (LQI) [ 21 ] to estimate the valuation of statistical life, and they are used to elicit the value of an individual in a society in the absence of a possibility to conduct a survey pre- or post- disaster.
In the selected literature, 7 papers out of 16 used stated preference methods. Within stated preference methods, two papers used choice modeling, while the other five used a contingent valuation method.
Papers using choice modeling method included Bockarjova et al. (2012) [ 22 ] and Rheinberger (2011) [ 23 ]. While Bockarjova et al. (2012) [ 22 ] carried out a choice modeling experiment via an internet-based questionnaire and elicited responses from people living in flood prone areas in the Netherlands in two separate studies, Rheinberger (2011) [ 23 ] undertook a choice experiment by recruiting respondents via a phone call prior to a mail survey.
For contingent valuation method, Leiter et al. (2010) [ 24 ] used face-to-face interviews and elicited people’s willingness to pay to prevent an increase in the risk of dying in a snow avalanche. Similarly, Hoffmann et al. (2017) [ 26 ] used a computerized payment card method to estimate the willingness to pay to reduce mortality risk in Chinese population living in four different cities in China. In contrast, Ozdemir (2011) [ 25 ] used a contingent valuation method as well, but used a mail survey to elicit willingness to pay to reduce the risks from tornadoes in the USA.
For non-behavioral methods, Dassanayake et al. (2012) [ 35 ] used a quality of life index method to evaluate intangible flood losses and integrate them into a flood risk analysis.
Other papers used one or a combination of methods. For example, Porfiriev (2014) [ 31 ] approached the economic valuation of human losses resulting from natural and technological disasters in Russia using the theory of welfare and an international comparative approach. Cropper and Sahin (2009) [ 12 ] used the comparative approach, along with transferring the VSL from USA to a whole list of countries classified by income groups by the OECD to estimate VSL.
There was a wide range of VSL values in the literature, ranging from ISD 143,000 to 15 million for one life [ 12 , 25 ]. Table 2 summarizes the estimated value of statistical lives in the articles included in the review. Disaster types range from natural disasters to technological disasters with some disaster types appearing more often than others in the literature, with earthquakes and floods being the most common. The VSLs appeared to increase over the years: while it was estimated to be USD 0.81 million in 2005 in Switzerland in the context of avalanches [ 34 ], it was evaluated between USD 6.8 and 7.5 million in 2011 [ 23 ].
Estimated values of statistical life in included articles.
Reference | VSL (in Millions USD *) | Countries | Disaster Types |
---|---|---|---|
Cropper and Sahin (2009) [ ] | 0.143 (Low-Income-Country) 4.27 (High-Income-Country) | Not Specified | Not Specified |
Porfiriev (2014) [ ] | 0.19 (International comparison) 0.33 (Welfare method) | Russia | Natural and technological |
Hoffmann et al. (2017) [ ] | 0.61 | China | Not Specified |
Sadeghi et al. (2015) [ ] | 0.73–1.4 | Iran | Earthquakes |
Fuchs and Mcalpin (2005) [ ] | 0.81 | Switzerland | Avalanches |
Daniell et al. (2015) [ ] | 2.2 | Australia, calculations applied to case studies in Turkey and Croatia | Earthquakes |
Cheng (2018) [ ] | 2.34 | Australia | Heatwave |
Leiter et al. (2010) [ ] | 2.3–4 | Austria | Avalanches |
Dassanayake et al. (2012) [ ] | 2.5–9.2 | Germany | Floods |
Zhai et al. (2003) [ ] | 3.3–9.2 | Japan | Floods |
Johansson and Kristrom (2015) [ ] | 5.2–12.8 | USA | Floods and storms |
Rheinberger (2011) [ ] | 6.8–7.5 | Switzerland | Snow avalanche and rockfalls |
Barbier (2022) [ ] | 1.25–7.7 | Italy | Earthquake |
Bockarjova et al. (2012) [ ] | 9.6 | The Netherlands | Floods |
Hammitt et al. (2019) [ ] | 10 | China | Not specified |
Ozdemir (2011) [ ] | 15 | USA | Tornado |
* Values were converted into United States Dollars (USD) in respective years. Source: Authors [ 37 ].
Disasters are complex events, and the assessment of losses they have caused is a compounded task. This review’s exploration of literature estimating the value of statistical life with regard to disasters highlighted the complexity and variability of the estimation of values of statistical life and the methods involved.
The geographical locations of studies included in the review showed the parts of the world where most of the studies were focused. An overwhelming majority of studies estimated the value of statistical life in high-income countries. The main reasons for this are related to the data availability and the investment made by developed countries in research and development for the advancement of science in general [ 38 ]. Low- and middle-income countries often experience several disasters occurring year round, and become trapped in a loop of disaster recovery and management annually. Amid ever-present financial constraints, disaster risk reduction and management planning to deal with disasters and their impact in the country therefore becomes much more demanding [ 39 ].
The estimation of economic damages due to disaster in a low-resource setting can also be challenging. Not all the houses, agricultural land, crops and other assets are insured in low- and middle-income countries. The insurance coverage is relatively small if not non-existent in these countries [ 40 ] and the data to quantify the impacts of disasters, such as the number of deaths, missing, affected population as well as reconstruction costs, are often incomplete and not well recorded. So, the unavailability of appropriate information becomes a big challenge in the first step of conducting research. This might be the reason why low- and middle-income countries are not well represented in studies estimating the value of life in disasters. As a result, the lack of studies in low- and middle-income countries can lead to a certain degree of extrapolation of results found in VSL calculation in high-income-country-based studies.
Furthermore, we note that the majority of articles measuring the value of life were about floods. Floods are indeed the most common type of disasters. In an analysis of disasters recorded in the EM-DAT database from 2000 to 2019, nearly half (n = 3254) of all recorded events (n = 7348) were floods [ 41 ]. However, there are many other types of disasters, and it is important to rely on such studies where those disasters were considered when measuring the value of a statistical life.
Methods used for VSL estimations showed significant diversity among the articles included in this review. Although the stated preferences method is the most frequent, it is closely followed by the adaptation method. There could be various reasons for this difference in methodologies across the literature. For instance, non-marketed good with no complementary or substitute market good may not have readily available individual data, and hence may lead the researchers to undertake stated preference methods with which to elicit people’s willingness to pay to reduce a hypothetical disaster risk through surveys [ 19 ]. The scope of the study and the budgetary constraints may also explain why a researcher chooses one method over the other. Additionally, the characteristics of the survey participants are another important factor, as they influence the type of survey that can be conducted and the methodology adopted. For example, if the target population is old and poor, face-to-face interviews in respondents’ private homes might be more suitable than internet-based questionnaires [ 42 , 43 ].
There was a wide range of monetary values of the VSL in the literature. These differences could be due to the level of income of the country where the disaster occurred [ 40 ]. The method of calculation could be another reason for such differences, for example, as consumers optimize their lifetime utility, thus neglecting intergenerational (long-term) utility, using willingness to pay (WTP) methods for a reduction of risk can often lead to overestimated values [ 44 , 45 ]. It could also simply be due to the differences in cultural norms between countries [ 40 ]. Furthermore, the context and the aim of the research and its evolution over the years might also explain variations across the studies. Further studies are required to establish a concrete cause for this observation. It should also be highlighted that low VSL estimates in low-income countries do not inherently mean that a human life is worth less. It could simply reflect individual income, the cost of commodities and the value of currency [ 8 , 46 ].
This study presents a number of limitations. First, the review only included articles published in English, and some studies may exist in other languages. Second, papers that did estimate a VSL considered a range of different methods, and therefore direct comparison of estimated values was not straightforward. Papers referring to economic impact in terms of natural environment or animals were also excluded, as they do not refer to value of statistical life; however, they can be important for calculating overall economic cost of disasters [ 47 , 48 ].
This study aims to explore literature estimating the value of statistical life with regard to disasters through a systematic review. After applying the inclusion criteria on the 2121 articles found in the initial keywords search, only 27 articles were included for final review. In the included literature, several attempts at estimating the value of statistical lives in disasters were identified; however, there was no consensus on the method used, and few investigations were carried out in a low- and middle-income country context. This review therefore provides a limited view of the value of statistical life calculations in disaster settings, which may become useful when implementing disaster risk reduction policies and calculating global losses incurred due to disasters. It reveals that an agreed, robust and multi-sectoral approach for the disaster and economics community remains to be defined.
For PubMed MeSH, terms such as sanctity of life, life sanctity, life sanctities, respect for life, economic life valuation, life valuation/s, economic valuation/s and economic life were used. In addition to this, the search was performed in SCOPUS and GOOGLE SCHOLAR.
The data extraction form recorded the descriptive aspect of all the studies included in the review, the including methodology used to calculate VSL, results, strengths and limitations. A total of 16 categories of information were extracted:
(1) Author, (2) Title, (3) Year published, (4) Journal, (5) Study location, (6) Aim of the study, (7) Disaster type, (8) Type of study (Theoretical/Empirical), (9) Study data source, (10) Study participants, (11) Method of VSL estimation, (12) VSL if given, (13) Strengths, (14) Limitations, (15) Relevant references and (16) Study design.
We are grateful to the European Commission for providing the Erasmus Mundus Grant for completing the Erasmus Mundus Master Course in Public Health in Disasters (EMPHID). We also thank USAID/DCHA/OFDA [ref no. 72OFDA20CA00072] for funding the research at Centre for Research on the Epidemiology of Disasters at the Universite catholique de Louvain.
A.K.: Formal analysis, investigation, writing—review & editing; S.B.: Formal analysis, investigation, writing—original draft; M.M.d.A.: Conceptualization, methodology, project administration, supervision, writing—original draft, writing—review & editing; R.C.D.: Funding acquisition, supervision, review & editing; P.A.G.: Funding acquisition, supervision, review & editing; S.T.: Conceptualization, funding acquisition, methodology, project administration, supervision, validation, writing—original draft, writing—review & editing. All authors have read and agreed to the published version of the manuscript.
Informed consent statement, data availability statement, conflicts of interest.
The authors declare no conflict of interest.
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Introduction.
Author: Nathan Smith, Reference and Research Specialist, Science, Technology & Business Division
Created: April 14, 2020.
Last Updated: June 29, 2023.
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Hurricanes. Tornadoes. Earthquakes. Floods. Avalanches. Wild fires. These events have been happening for millennia and have affected humans throughout every part of the globe. According to the International Journal of Disaster Risk and Reduction External , natural disasters are defined as "...catastrophic events with atmospheric, geological, and hydrological origins (e.g., droughts, earthquakes, floods, hurricanes, landslides) that can cause fatalities, property damage and social environmental disruption."
Arguably the most famous earthquake in U.S. history is that of San Francisco in 1906. It occurred on April 18 and had an estimated magnitude of 7.9 (estimated because the Richter Scale, which is used to measure the magnitude of earthquakes, was not invented until 1935 by Charles F. Richter). Though it lasted less than a minute, the damage was extensive and the death toll, though uncertain, was up to 3,000. The earthquake and subsequent fires caused by ruptured gas mains, which lasted for four days, destroyed about 80% of city. The earthquake, one of many for this region, occurred due to the tectonic activity along the San Andreas Fault, which forms the boundary between the Pacific and North American plates.
In 1900, a hurricane made landfall near Galveston, Texas. Not only was it the deadliest hurricane in U.S. history, but it was the deadliest natural disaster in U.S. history! This hurricane made landfall on the night of September 8 and was estimated as a category 4 with a storm surge of over 15 feet that devastated the city. There has been speculation on the total number of fatalities, but the most cited number is 8,000, which is a significant portion of the nearly 38,000 in total population at the time.
The 2019-2020 bushfire season in Australia was the worst on record; 46 million acres were burned by hundreds of fires which caused dozens of fatalities. The fires' effect on air quality was demonstrated by the Air Quality Index putting several parts of the country into the hazardous zone, including areas around Sydney. The toll of the fires could also be seen in the wildlife populations. It is estimated that over 1 billion animals died during the course of the fires, including many endangered species.
The resources in this guide provide information on how and why these events occur and what people can do to better prepare for the next occurrence.
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Disaster and emergency planning for preparedness, response, and recovery.
Emergency and disaster planning involves a coordinated, co-operative process of preparing to match urgent needs with available resources. The phases are research, writing, dissemination, testing, and updating. Hence, an emergency plan needs to be a living document that is periodically adapted to changing circumstances and that provides a guide to the protocols, procedures, and division of responsibilities in emergency response. Emergency planning is an exploratory process that provides generic procedures for managing unforeseen impacts and should use carefully constructed scenarios to anticipate the needs that will be generated by foreseeable hazards when they strike. Plans need to be developed for specific sectors, such as education, health, industry, and commerce. They also need to exist in a nested hierarchy that extends from the local emergency response (the most fundamental level), through the regional tiers of government, to the national and international levels. Failure to plan can be construed as negligence because it would involve failing to anticipate needs that cannot be responded to adequately by improvisation during an emergency.
Plans are needed, not only for responding to the impacts of disaster, but also to maintain business continuity while managing the crisis, and to guide recovery and reconstruction effectively. Dealing with disaster is a social process that requires public support for planning initiatives and participation by a wide variety of responders, technical experts and citizens. It needs to be sustainable in the light of challenges posed by non-renewable resource utilization, climate change, population growth, and imbalances of wealth. Although, at its most basic level, emergency planning is little more than codified common sense, the increasing complexity of modern disasters has required substantial professionalization of the field. This is especially true in light of the increasing role in emergency response of information and communications technology. Disaster planners and coordinators are resource managers, and in the future, they will need to cope with complex and sophisticated transfers of human and material resources. In a globalizing world that is subject to accelerating physical, social, and economic change, the challenge of managing emergencies well depends on effective planning and foresight, and the ability to connect disparate elements of the emergency response into coherent strategies.
Emergency planning can be defined as the process of preparing systematically for future contingencies, including major incidents and disasters. The plan is usually a document shared between participants and stakeholders that specifies tasks and responsibilities adopted in the multi-agency response to the emergency. It is a blueprint for managing events and, as such, should be responsive to management needs. It should specify the lineaments of action, collaboration, command, and communication during a civil contingency, such as a disaster or major event; in other words, it is the framework for emergency response. The maintenance of public safety, limitation of damage, protection of the vulnerable, and efficient use of life-saving resources are some of the goals of the plan. Although the end product is a document, emergency planning is more a process than an outcome, especially as the plan itself will need to be updated over time as circumstances change.
As we know it today, emergency planning for disasters derives from civil defense, a form of social organization designed to protect civilians against armed aggression. The latter is a relatively new concept that in its modern form antedates the Second World War by only a very brief period. Although there had been rudimentary forms of organization for the protection of non-combatants in previous conflicts—for example, the American Civil War of the 1860s—the attack on Guernica, in the Basque country of Spain, on April 26, 1937 , by German aircraft was the first concerted aerial bombardment (it killed 1,654 civilians) and the first occasion that an attack had to be countered by properly organized measures of protection. It was a curtain raiser to the bombardments of the early 1940s, in which civil defense grew enormously, although largely without the benefits of fully codified plans. During this period, civil defense operatives were responsible for search and rescue, safeguarding and accommodating the survivors of bombing raids, ensuring public safety and interdicting areas that had become unsafe.
The temporary apogee reached by civil defense during the Second World War was subsequently followed by reorganization in order to face the demands of the Cold War, in which civilian life was overshadowed by the threat of a thermonuclear exchange between the great powers. During this period, plans were usually kept secret and were predicated on the assumption—highly debatable—that citizens could be protected and given shelter against nuclear blasts and radioactive fallout.
Détente and the dissolution of the Eastern Bloc led to the gradual end of the era of civil defense , and the slow rise of civil protection , which is designed to protect people against the effects of natural, technological, and societal hazards. In its purest form, civil defense is a service provided by the central state and directed at the national level (i.e., it is fundamentally “top-down”). Civil protection is a decentralized service (i.e., “bottom-up”), in which the basis of organization is local, which usually means that it is centered on the municipal level.
Emergency planning is a relatively young field that began to develop systematically in the 1970s, coincidentally with the rise of civil protection. Initially, it did so largely in response to technological hazards, such as toxic spills and industrial explosions. Later, there was an increasing emphasis on natural disasters, such as floods, storms and earthquakes.
Academic studies of disaster have a somewhat longer history than does civil defense. They began in earnest in the 1920s with the founding of a sociological approach and, in parallel, a human ecological school of thought, which was mainly based in the discipline of geography. Development was slow until the 1950s, when fear of the consequences of nuclear war gave impetus to the study of how human populations behave in crisis situations, using natural disasters as—rather inadequate—analogues for a thermonuclear exchange. Earlier, geographers had started to study the human dimensions of the flood problem, notably Gilbert Fowler White, whose thesis on adaptation to floods was published in 1945 . Starting in the 1970s, there was a sustained increase in studies of extreme natural phenomena, which gradually came to grips with the role of such hazards to human life and activities. In the late 1970s, a school of thought developed that suggested that vulnerability, not hazards, is the real key to understanding disaster. Despite countless demonstrations of this axiom, studies of vulnerability have lagged behind those of hazard, the other principal ingredient in the making of disaster. In terms of how academic work supports emergency planning, this means that there has been a plethora of studies of the inputs to plans (see, for example, the hazard scenarios in the section “The Use of Scenarios”), but a paucity of studies of how to construct and use emergency plans. On this basis, emergency planning has developed in a somewhat faltering mode, in which only some of the activities associated with it are well served with academic inputs.
Most civil contingencies are small enough to be resolved adequately without qualitative changes in daily management procedures or quantitative changes in the availability of resources. Hence, this article concentrates on the small minority of emergencies, usually fewer than one in ten, that are large enough to substantially disrupt daily life and normal working procedures. There is no consistently reliable way of distinguishing among major incidents, disasters, and catastrophes (but see Table 1 for an attempt at this). Nevertheless, all of these events have in common the fact that they must be resolved by the suspension of normal procedures and substitution of emergency ones. In the latter, the imperatives, tasks, and relationships among participants are sufficiently exceptional to require substantial reorganization and working methods that differ from those employed in workaday routines.
Emergency response involves a mixture of plans, procedures, and improvisation. To some extent, the last of these is inevitable, but it needs to be limited by preparedness. It is axiomatic that planning and procedures should not be improvised during an emergency when they should have been thought through and created beforehand. The consequence of unwonted improvisation is inefficiency in emergency response, which may have serious or tragic consequences. A degree of uniqueness present in each new disaster means that improvisation cannot be avoided, but foresight and preparedness can constrain it to a necessary minimum. Moreover, emergencies are always occasions for learning, and a significant part of the body of experience on which plans are based comes from the mistakes, inefficiencies, and improvisations of the past. Although many publications have the phrase “lessons learned” in their titles, there is no guarantee that a lesson will indeed be learned. If that does indeed happen, measurable positive change will result directly from the lesson. For example, lack of search-and-rescue equipment may be keenly felt in structural collapses that trap people. Hence, probes, props, and personal protection equipment may be acquired and personnel trained in how to use them.
Incidents | Major incidents | Disasters | Catastrophes | |
---|---|---|---|---|
| Very localized | Fully or partially localized | Widespread and severe | Extremely large in the physical and social sphere |
| Local resources used | Mainly local resources used, with some mutual assistance from nearby areas | Intergovernmental, multi-agency, multi-jurisdictional response needed | Major national and international resources and coordination are required |
| Standard operating procedures used | Standard operating procedures used; emergency plans may be activated | Disaster or emergency plans activated | Disaster or emergency plans activated, but huge challenges may overwhelm them |
| Local resources will probably be sufficient | Local resources and some outside resources needed | Extensive damage to resources in disaster area; major inter-regional transfers of resources | Local and regional emergency response systems paralyzed and in need of much outside help |
| Public generally not involved in response | Public largely not involved in response | Public extensively involved in response | Public overwhelmingly involved in response |
| No significant challenges to recovery | Few challenges to recovery processes | Major challenges to recovery from disaster | Massive challenges and significant long-term effects |
Note . Adapted from Tierney, K. (2008) Hurricane Katrina: Catastrophic impacts and alarming lessons. In Quigley, J. M., & Rosenthal, L. M., (Eds.). Risking House and Home: Disasters, Cities, Public Policy . Berkeley, CA: Institute of Governmental Studies, Berkeley Public Policy Press, 119–136.
There is a fundamental distinction between plans and procedures. An emergency plan should not have to teach a fireman how to put out a fire, or the police how to direct traffic. Instead, it should articulate and integrate the procedures to be used in a major emergency by assigning responsibilities and ensuring that all personnel involved in complex field operations understand both their own roles and those of other participants. Thus, one can make an analogy between the emergency response and a symphony. Individual instrumentalists have their own music (i.e., the procedures), while the conductor has the score (i.e., the plan). The common objective is to work in harmony.
Above all, emergency planning should be a process , rather than a product or outcome. At its most essential, it must match urgent needs to available resources, and do so in a timely way that avoids procrastination and delay. Good emergency plans are realistic as well as pragmatic. For instance, there is no point in making arrangements to use resources that are not available and are not likely to be supplied within a useful time frame. Hence, plans should take account of both the limitations and the capabilities of response. At this point, it is useful to introduce the concept of thresholds (Table 2 ). The “bedrock” level of emergency planning is the municipal level or local area. This is because, however extensive a disaster may be, the theater of operations for managing and responding to it is always local. However, if local resources are overwhelmed, it becomes necessary to move up the scale of response to intermunicipal, regional, national, or even international responses. Each of these is associated with a threshold of capability, which is determined by the availability of trained personnel, expertise, equipment, supplies, communications, vehicles, and buildings. If the magnitude of the emergency exceeds or overwhelms local capabilities, then it is necessary to invoke higher levels of response. However, these should always aim to reinforce, not supplant, the local ability to respond to the emergency. Once the outside forces have departed, inhabitants of the local area will be left on their own to manage the aftermath, and hence they need to be in good shape to do so. Supplanting local resources, decision-making capabilities, and responses will only leave the local area weaker and less able to manage the longer-term aftermath and any emergencies that may occur in the future.
Local incident | Local response | A |
| ||
Small regional incident | Coordinated local response | B |
| ||
Major regional incident | Intermunicipal and regional response | B |
| ||
National disaster | Intermunicipal, regional, and national response | C |
| ||
International catastrophe | Intermunicipal, regional, and national response, with international assistance | C |
Note . Simplified version: A = local response, B = regional response, C = national response.
Emergency planning is an approximate process that, in many instances, is little more than codified common sense. It also involves a collective effort and is thus a participatory process. In order to avoid sins of omission or commission, it requires experience and training. Regarding the former, the lack of a plan could be construed as negligence in the face of a demonstrable need to protect the public. Despite this assertion, some emergency managers have argued that plans tend to be unnecessarily restrictive and an improvised response is somehow stronger and more vital than one conditioned by a plan. Military strategists from Napoleon Bonaparte to Dwight D. Eisenhower have noted that, when preparing for war, plans have little value, but planning is essential. This underlines the importance of planning as a process, and above all a process of discovery. In this sense, whether or not the plan works during an emergency is of secondary importance: more vital is what the plan tells us about the needs of preparedness and organization. Moreover, emergency plans generally need to be adapted to particular emergency situations, which further underlines the view that planning is a process, and an ongoing one.
At this point, it is opportune to consider what sorts of events and situations should be the object of emergency plans.
Much has been made of the need for “all-hazards” emergency plans. No place on Earth is entirely free from hazard and risk. Hence, all places need emergency preparedness, but few of them are likely to be subject to only one kind of hazard. An emergency plan must, therefore, be adaptable to both anticipated and unexpected hazards. For many years, the city of Florence, in Italy, had a municipal emergency plan that only addressed the contingency of flooding. In the postwar period, the largest disaster that the city had to manage was the major flood of 1966 . However, during the lifetime of the plan (about 20 years), only limited flooding occurred, and the biggest emergencies were an air crash and a terrorist bomb. Likewise, on September 11, 2001 , emergency coordinators in Washington, DC, had to manage the response to the aircraft that crashed into the Pentagon (and the ensuing citywide chaos) by adapting and using a plan made specifically to deal with the so-called “millennium bug,” or in other words anticipated widespread computer failure. A good emergency plan makes provision for managing all the known and anticipated hazards (the seasonal and recurrent events), while at the same time offering generic protocols to manage the unanticipated ones.
One issue that has long perturbed emergency planners is the size of event for which plans should be configured. If one assumes that recurrent hazards are in a steady state, then somewhere there should be a “happy medium,” in which an extreme event is neither too large and infrequent to be expected to occur during the life of the plan, nor too small and frequent to need significant emergency provisions. The first problem with this arrangement is that, especially regarding natural hazards, there are few cases in which an adequate magnitude—frequency relationship has been established. Hence, the likelihood of an extreme event of a given size may be conjectural, rather than scientifically determined. The second problem is that the time series of events may be nonstationary. For example, there is overwhelming scientific consensus on the occurrence of climate change, and few scientists now doubt the speed at which it is occurring. Damage tends to be a nonlinear function of extreme meteorological events, in the sense that small increases in, for example, wind speed lead to disproportionately large increases in wind damage to structures. The same may be true of casualties, although here the relationship is complicated by factors of perception and behavior in people’s reaction to immediate risk.
It is often said that “we plan for the last event, not the next one.” There is indeed a tendency to base assumptions about the size and characteristics of each event that will be faced in the future on the historical record of such events in the past, particularly the recent past. What if the next event is entirely out of character? The magnitude 9 earthquake that occurred off the east coast of Japan in March 2011 caused a tsunami that was considerably higher than those that most parts of the coast had prepared for (Figure 1 ). People were washed off refuge mounds, and the Fukushima Daiichi nuclear plant was overrun with water, leading to meltdown. The plant was protected against a tsunami that would have resulted from an offshore earthquake up to magnitude 7.5. Much emergency preparedness against riverine flooding is based on the notion of the 100-year flood, and the depths and geographical areas that such an event would inundate. Leaving aside the question of whether estimates of the magnitude of a flood with an approximate recurrence interval of once in a century are accurate, there is no hard-and-fast operational reason why the 100-year flood should be more significant or damaging than any other. However, it is legitimate to discuss the size of flood with a 1%, or once in a century, probability of occurring in any given year, whether or not that should be the flood for which protection measures are designed. In the final analysis, emergency planning has to be realistic. This means that it can only be applied to resources that actually exist or can be obtained within an appropriately brief time frame. On that basis, the question of what size of event to prepare for is more a policy issue than a planning one. In synthesis, the problem of how to prepare for exceptionally large events remains unresolved, both in terms of what is necessary and what is feasible.
Figure 1. The remains of the emergency management center at Shizugawa, on the northeast coast of Japan. Here, the tsunami of March 11, 2011, was higher than the building. Personnel were drowned while they struggled to broadcast warnings, although a few of them survived by climbing up the radio mast on top of the building. The size of the tsunami underlines the difficulty of estimating the magnitude of events when planning for them.
Emergency and disaster planning is a relatively new field, and one that is evolving rapidly, driven by intensifying hazards, burgeoning vulnerabilities, and emerging risks. Hence, there is no established formula according to which a plan should be prepared. Nevertheless, there are canons and practices that must be respected. As noted above, a plan should focus on ensuring that a good response to threats, emergencies, and recovery processes occurs at the local level.
The primary resource is information, and hence everything possible should be done to ensure that flows of vital data and communications are unrestricted and properly focused on essential needs. Emergency management, as supported by prior and ongoing planning, should ensure that organizations can work together effectively under unfamiliar circumstances, possibly including organizations that have no formal relations under normal, non-emergency circumstances. The plan should ensure that every participant in the response to an emergency has a role, and that all anticipated tasks are covered such that the risk of hiatuses or disputes about responsibilities is minimized.
One way to demonstrate the connection between emergency planning and emergency management is through the provisions to manage information. Emergency communication needs to be sustained, flexible, and clear. Decisions and communications need to be recorded. The emergency planner can help this process by ensuring that the technological means of communication are present and are robust in the face of potential failure, the protocols for sending messages are established, and the priorities for communication are known to participants.
The process of formulating an emergency plan is similar, and parallel, to urban and regional planning. Sadly, the two disciplines rarely enjoy sufficient connection and interchange. This is unfortunate, because they have much in common. In emergency planning, as in urban and regional planning, perhaps 70% of the problem to be solved is spatial (i.e., geographical) in nature. The answer to the question “What is where?” is at the root of many provisions designed to manage emergency situations. Like urban and regional planners, emergency planners need to study the geography, demography, economics, social relations, and culture of the area that forms the jurisdiction of the plan. This is essential if the plan is to respond well to local hazards and vulnerabilities and be compatible with local perceptions, traditions, activities, and expectations. Other than that, the five stages of emergency planning are research, writing, publicity, operations, and revision. Research will ensure an adequate basis of knowledge of hazards, vulnerabilities, local characteristics, and capacities. Writing will create the plan, and its appendices and abbreviated aides memoires. Publicity and training will make it known to the users and the organizations they represent, and operations will test elements of the plan in terms of feasibility, appropriateness, and efficiency. Finally, the plan should be a living document; hence, it will need to be updated frequently and consistently to take account of changes and new knowledge.
The essence of emergency and disaster management is its capacity to tackle pressing needs with maximum efficiency and celerity but with scarce resources and in the absence of much necessary information. Before the event, the plan must make assumptions about what is needed during the event. Those assumptions need to be considered within the compass of what is feasible with the available human and technical resources. One reason why the plan must constantly be updated is that one assumes there will be a program of continuous improvement in the resources, and one trusts that it will take place in the light of the evolving body of knowledge of hazards and the needs that they provoke.
Emergency plans need to be written in the light of the prevailing legislation, as well as the provisions it makes for tackling major incidents and disasters. In many countries, legislation exists at both the national level and the level of regions, states, provinces, departments, counties, or prefectures—what is known as the intermediate tier of government. In the United States, the main federal law is the Robert T. Stafford Disaster Relief and Emergency Assistance Act (the Stafford Act), which has evolved since 1974 . In India, another federal republic, the national law was formulated in 2005 . In the United Kingdom, the Civil Contingencies Act dates from 2004 , and in Italy, a law passed in 1992 establishes the national civil protection system. In most cases, the basic law assigns responsibilities for the principal tasks to be accomplished in national emergency situations. There may be a legal obligation to draw up emergency plans, but it seldom, if ever, extends to the quality and compatibility of such plans.
Usually, compliance with legislation is simply a matter of comparative reading, or in other words ensuring that there are no glaring incompatibilities. The compliance may also have to extend to other kinds of legislation, such as that pertaining to health and safety at work, environmental protection, industrial safety, national security, and the division of responsibilities between different tiers of government. Once again, compliance can usually be ensured by comparative reading, although there may be cases in which legal requirements conflict with one another, for example between environmental legislation and laws about resource utilization.
One source of complexity in emergency planning is the need to integrate several dimensions into the programmed emergency response. Hierarchical divisions refer to the tiers of government—from national, through regional, to local. Geographical divisions indicate the spatial jurisdictions to which plans refer, and possibly also to questions of mutual assistance. Organizational divisions refer to the different agencies that participate in emergency responses, such as the “blue light” services (police, fire, and ambulance), technical groups, and volunteer organizations. Lastly, functional divisions indicate the different fields involved, such as government, health-care, public order, public works, economy and employment, finance, and the private sector (Figure 2 ). The emergency plan is one contribution to the process of articulating a system of response to civil contingencies, in which an optimum balance is sought between integrating these forces and allowing them a degree of autonomy and freedom of action.
Figure 2. The different dimensions of division and integration in emergency planning and management.
Whether natural or anthropogenic, hazards vary considerably in their predictability and the amount of lead time, if any, for preparations to take place. Nevertheless, warning and associated responses are two vital elements of most emergency plans. Short-term warning must be distinguished from the longer-term predictability of hazards. Earthquakes, for instance, are mostly predictable in terms of the basic tenets of magnitude, frequency, and location, but not with regard to impending shocks in a short time window, such as 48 hours. In contrast, with adequate monitoring using Doppler radar, warnings can be issued for tornadoes with lead times of 20 to 120 minutes, and remote sensing together with digital modeling can give a reliable picture of a hurricane track many hours before the storm makes landfall.
Warnings have three essential components: scientific and technical, administrative, and social (Figure 3 ). The absence or ineffectiveness of any of them renders the warning system inoperable. Scientific information on an impending hazard must be transformed into a message to be acted upon, and a decision must be taken to warn affected people, who must then hear and react appropriately to the warning. The emergency plan should determine how to transform information on hazards to advice or orders on how to react. It should prescribe the means of disseminating the message and monitoring the social reaction to it. In practical terms, evacuation or sheltering is usually the most appropriate reaction to warning and the best way of moving people out of harm’s way. However, the means and the routes to evacuate people must be available (or there must be appropriate, safe locations for in situ or vertical evacuation). Horizontal evacuation may require reception centers with staff, bedding, methods of procuring, preparing, and distributing food, and so on.
Figure 3. The components of the warning process.
Modern emergency responses are heavily reliant on information and communications technology (ICT). Many algorithms have been written to assist emergency operations, for example, by providing an “expert system” that aids decision making, or by helping record decisions as they are made. For example, terrestrial trunked radio (TETRA) systems can be used to provide flexible communications between different services and groups of responders. Emergency plans should reflect these innovations and the opportunities they bring for sharing information and developing a synoptic picture of a rapidly evolving situation on the ground. Plans can include or refer to protocols for messaging and communications, and thus help clarify and standardize them.
The emergency plan should either prescribe or describe the structure of command and management to be utilized in the case of a disaster or major incident. Modern information technology has tended to flatten the chain of command and has given rise to a more collaborative form of management, which lessens the reliance on militaristic principles of “command and control.” Nevertheless, there will need to be a web of formal relationships between different organizations and units that participate in the response to disaster. The focal point of many of these is the emergency operations center (EOC), which is usually also the “natural home” for an emergency plan, or, in other words, the place where it is most appropriate to draw up and maintain such an instrument. The EOC needs to be a center of communications and management, one that has functional autonomy (e.g., its own electrical generator and fuel stocks).
In a fully functional civil protection system, emergency resource hubs such as EOCs usually operate as a nested hierarchy. They will function within the compass of plans made at different levels of government and by different jurisdictions. It follows that the emergency plans themselves will need to ensure interoperability and a rational division of responsibilities, so that all tasks can be covered in emergencies of different sizes. Once again, this involves comparative reading of plans and, preferably, some national guidelines for ensuring compatibility.
A further issue is the need for emergency planning in different sectors. The United Kingdom’s Civil Contingencies Act of 2004 obliges the providers of fundamental services in the private sector to draw up emergency plans. This is necessary, as much of the nation’s critical infrastructure is run by private-sector operators. Industrial firms also need plans, so that they can cope with technological failures and their consequences, and commercial companies need to ensure business continuity. Emergency plans are needed in both hospitals and the health systems of which they form a part. Hospital plans should state the preparations needed for internal and external emergencies. The former refers to contingencies such as fire, structural collapse, or contamination, and the latter mainly deals with the need to cope with mass casualty influxes. In addition, public transport services need emergency plans to guarantee the movement of people and goods during a crisis and its aftermath. For example, the plans for an airport should be integrated with those of the city and region in which it is situated. Finally, there is an increasing realization that emergency plans are needed to protect cultural heritage, which includes a huge variety of sites and artefacts, many of which have highly specialized conservation requirements. Loss of cultural heritage in disasters such as floods and earthquakes can deal a catastrophic blow to the intellectual and artistic life of a country by obliterating or damaging an irreplaceable legacy.
Among specialized emergency plans, it is worth singling out those required for educational institutions. The collapse of thousands of schools in earthquakes in Pakistan ( 2005 ) and China ( 2008 ), and the consequential loss of thousands of young lives, underlines the importance of providing a safe education to pupils and students. This is a moral requirement, as well as one that all parents would support. Despite this, emergency planning for schools tends to be neglected and underrated. It is not merely a question of evacuation. Plans need to assess hazards and design strategies to manage situations safely. As in other forms of emergency planning, scenarios are needed. In one exemplary case, a school has developed different strategies to manage the response to floods and earthquakes, both of which threaten it. As teachers are in loco parentis for their young charges, there is a requirement to ensure that school students are looked after in safety throughout an emergency. Schools and other educational institutions have been the target of natural hazards,h such as earthquakes, tornadoes, landslides, floods, and snowstorms; terrorism, such as marauding gunmen; and structural collapse and fire. When many young lives are lost, the sense of moral inadequacy can be universal, but not enough has been done to ensure that emergency planning for schools is transformed into universal practical measures to protect children and young adults.
The art of emergency planning involves “anticipating the unexpected.” For example, one important aspect that is often overlooked is veterinary planning. This has three main categories: domestic, farm, and wild animals. Many people will not evacuate in the face of a major threat unless they can take their pets with them, and hence, provision needs to be made to accommodate domestic animals. In pastoral areas, farm economies are dependent on the care and welfare of animals, which can be trapped and drowned by floods, frozen by blizzards, affected by epizootic diseases, or deprived of feedstock. Planning to manage wild animals mainly refers to threats to the human population posed by ecological disruption in disasters due, for example, to the migration of dangerous reptiles or the possible spread of rabies. Another form of planning that is roundly neglected is that associated with prison populations. In floods, storms, and earthquakes, these individuals have been either confined to dangerous localities or released indiscriminately into the community. Prisoners have human rights, including the right to custodial safety, but to release hardened criminals into society may pose risks to the general population. Finally, during the difficult circumstances engendered by disaster, pharmaceutical emergency planning is needed in order to ensure continuity of medication for patients who depend on medical drugs.
One ingredient of most emergency plans is a stipulation of the alert and call-up procedures for personnel. These need to be integrated with the potential phases of warning, which at their simplest are hazard watch (impact is possible or likely) and hazard warning (impact is highly likely or certain). A part of the plan may be dedicated to the preparations to be made before impact, if time is likely to be available to carry them out. Examples include putting up mobile flood defenses, marshalling and readying vehicles and equipment, and testing and readying the means of field communication. The impact phase of a disaster is usually a period, more or less brief, characterized by dynamic evolution and acute shortage of information. One of the first needs is for an assessment that determines whether to move into emergency mode. The declaration of a state of emergency allows the formal abandonment of normal working procedures and the immediate adoption of those that pertain strictly to the disaster. Hospital beds will be cleared, leave will be cancelled, personnel will move to predetermined locations, lines of communication will be opened, and so on. The emergency phase may continue for hours or days, and in exceptional cases for weeks. However, it should end with a formal declaration of “stand-down,” as prescribed in the plan, which releases personnel for leave and ordinary duties.
In most parts of the world, major incidents and disasters are, thankfully, rare, although they may be an ever-present threat. The emergency plan therefore needs to be tested under hypothetical conditions. Exercises and drills can be divided into table-top, command post, and field-based simulations. The last category is clearly the most onerous, and it may require up to six months of meticulous planning. Generally, none of these methods is capable of testing the whole plan, and so elements of it must be selected for verification by simulation. One common element is the ability of different organizations to work together under specific, unfamiliar circumstances; for example, the ability of different medical response organizations to set up and run a field hospital together. Exercises need to be designed with clear, well-formulated objectives, and the progress of the simulation needs to be carefully monitored so that any need for improvements can be detected and communicated to participants in post-exercise debriefings and reports. All of this needs to be done in an atmosphere of constructive support, and certainly not recrimination, as the aim is not to examine but to help participants improve their performance during future emergencies. Simulations need to be treated as learning processes, from which it may be possible to derive improvements to the plan. One hopes that in real emergencies it will also be possible to learn lessons and improve the emergency plan on the basis of real experience. One such lesson is that personal familiarity with other participants in emergency operations greatly improves the ability to work together. This underlines the value of emergency simulations and drills.
The emergency plan should be a living document. In fact, there is nothing worse than the “paper plan syndrome”—or its modern digital equivalent—in which the plan is formulated and relegated to a desk drawer (or a hard drive) without being used or updated. Such plans can do more harm than good when they are eventually put to the test by a crisis. As time wears on, both small and large changes will occur. Hence the plan should include provisions not only for disseminating it and training its users, but also for a process of constant updating, with checks at regular intervals, perhaps every six months.
The next section discusses the contents of emergency plans in more detail.
So far in this article, emergency plans have been viewed as if they consist of nothing but collections of generic provisions for managing a notional crisis. These are necessary, in that the plan may need to be adaptable to unexpected crises. However, many—perhaps most—emergencies are predictable events, at least in terms of what is likely to happen. Not all disasters are cyclical events (those of seasonal meteorological origin are the closest to this), but many are recurrent according to established magnitude—frequency relationships, although, as noted, these may be imperfectly known. Over the last 30 years or so, knowledge of natural hazards has increased spectacularly. The threats, probabilities, time sequences, and effects of floods, landslides, storms, earthquakes, volcanic eruptions, and so on, are now much better understood than was the case half a century ago. Unfortunately, despite calls in the early 1980s to make it a central issue, understanding of vulnerability to natural hazards has not evolved at the same pace. In most places, vulnerability, not hazard, is the key to disaster potential; this is unfortunate and needs immediate improvements in research. Nevertheless, in places where hazards are recurrent, emergency planning against them should be based on scenarios. These will enable urgent needs to be foreseen and situations to be anticipated by providing the right resources in the right place and at the right time. Hence, scenarios should be a vital ingredient of emergency plans.
A scenario is a postulated sequence or development of events. Scenarios can be used to reconstruct past disasters where the evolution of the events is incompletely known. However, the main use in emergency planning is to explore possible future events and outcomes. A scenario should not be a rigid prediction of future developments. It is instead an exploratory tool. In most scenarios, there is not one outcome of developments, there is instead a range of outcomes. To establish this is to think creatively about the future.
Typically, an emergency planning scenario will be based on a “reference event,” or possibly more than one event. This will be a disaster that in the past affected the area covered by the plan and that it is deemed may be repeated in the future. Efforts must be made to assemble a plausible set of hazard data that represent the range of possibilities for the physical impact: for example, the wind speed, precipitation, and track of a storm, or the magnitude and epicentral location of an earthquake. The nature of the built environment, the economy, demography, and social characteristics of the area, and the assets at risk will all have changed since the reference event. Modern conditions must be added to the scenario. This then needs to be developed as a temporal sequence of evolution in terms of hazard occurrence, the impact on vulnerable people and assets, and the response of emergency services (Figure 4 ). Because aggregate patterns of human behavior change during the day, the week, and possibly also the year, several runs of the scenario may be needed. For example, an earthquake scenario may use the last seismic disaster as its reference event, but the future projection may need to be made for an earthquake that occurs during the night, on a working day, and on a holiday, as there will be different effects on people and the buildings and structures that they use.
Figure 4. Scenario methodology in emergency planning.
It is opportune to use a simple systems theory methodology to construct the scenario. The inputs are the reference event and accompanying conditions (social, environmental, economic, etc.). The output is the outcome of the disaster and its management. The throughputs and transformations are the evolution of the scenario over time. One can, if necessary, construct subsystems that embrace, for example, the health system response to the disaster, or the impact on local civil aviation. The point of using scenarios in emergency planning is to be able to explore and anticipate needs generated by predictable future disasters. Hence, the scenario should produce a range of possible outcomes and should be used as an exploratory tool. It should be used in conjunction with an audit of emergency resources designed to answer the question of whether they are sufficient and appropriate to match the anticipated needs.
Emergency planners need not be frightened of the unknown. There has been much debate on the existence of so-called “black swans,” or unanticipated events. These may be all very well in economics, but in disaster management the black swan has become extinct, and its ecological niche has been occupied by the red herring—or thus is the present author’s opinion. This means that there is very little in future events that will not have occurred in some form in the past. The scale and configuration may be different, but the components are present in the historical record. However, this should not be interpreted as a call to look resolutely backwards. Scenario builders will require considerable skill if they are to make a reliable assessment of the magnitude and consequences of future events. This underlines the value of scenario methodology as an exploratory tool, in which known regularities and established evidence are projected into a hypothetical future space and are allowed to develop in an “envelope” of possible developments.
One way of extending the emergency plan into the crisis phase and adapting it to rapidly changing needs is to continue the planning process during the emergency (Figure 5 ). Strategic planning is essentially about finding resources and ensuring that the assemblage of response units, plans, and initiatives is generally going in the right direction, so that it will meet the needs of the population affected by disaster. Tactical planning is largely about apportioning resources so that they can be used on the ground by operational units. Operational planning is about assigning tasks, constituting task forces, and monitoring the evolution of the situation so that tasks are set and accomplished. At all three levels, the permanent emergency plan is a backdrop to activities. It should be neither slavishly and rigidly followed nor ignored. One hopes that it will ensure that fundamental tasks are apportioned, responsibilities are clear, and appropriate action is stimulated.
Figure 5. The dynamic hierarchy of emergency plans.
Emergency planning should be a co-operative effort in which the users and beneficiaries of the plan are stakeholders who have an interest in ensuring that the plan works well. It is also important to create and maintain interoperability, so that emergencies that require large-scale responses do not lead to chaos and to groups of people working at cross purposes.
One example of success in ensuring cooperation is the introduction and diffusion of the incident command system (ICS) in the United States since 1970 , when it was first devised as a measure to combat wildfire in California. ICS is a modular system that is usually implemented at the site of an incident and can be aggregated to higher levels. It has been codified by the US Federal Emergency Management Agency and is available online at National Incident Management System , which ensures a degree of interoperability among many different forces. This is highly necessary, as in a major incident or disaster, scores of agencies and organizations may work together—not at cross purposes, one hopes!
In Europe, interoperability is gaining ground, but the diversity of legal and administrative systems among the states of Europe, and the different histories of civil protection that they enjoy, means that the process is slow and complex. During the response to the earthquake in Haiti on January 2010 , field hospitals sent from European countries lacked interoperability of equipment and procedures, because they were functioning according to different, not entirely compatible, standards. Thus, they experienced difficulty in supporting each other’s work.
One absorbing question about disaster response is the relationship between emergency planners and emergency or disaster managers. In some countries (for example, Italy), they are one and the same, which makes sense, in that the plan needs to be prepared by people who understand the dynamics of managing an emergency. In other countries, such as the United Kingdom, the planners and the managers tend to be separate figures. In traditional systems, the emergency manager is a commander, much as military officers command their battalions. In more modern, evolved systems, the manager is much more of a coordinator, a person who manages resources and ensures that autonomous work by experts and task forces is able to go ahead in a co-operative mode. Over the years, as emergency response has become more professional, the need for command has diminished. This does not reduce the need to apportion and assume responsibility, but it does make a subtle and profound shift in the way that that occurs. Modern emergency planning is less about specifying chains of command and more about ensuring a “joined up,” coordinated, approach that covers all essential tasks and uses resources in the most efficient, effective way possible.
The statement that “the need for command is diminishing” needs to be qualified by the cultural requisites of different countries. This observation is broadly true, thanks in part to the effect of information technology, but the degree to which it applies varies considerably from one country to another. In the United States, the management of large emergencies (such as Hurricane Katrina in 2005 ) still relies on considerable input from military and paramilitary forces (i.e., the National Guard). It should be noted that the response to Katrina revealed a terrible lack of preparedness at the key levels: state and local authority. Here, planning was extemporary, but compensatory response of the federal level of government was slow and initially rather disorganized. Militarized responses are very important in China, were the national government has been suspicious of the rise of volunteer groups. In many other countries, military forces are used in disasters to compensate for deficiencies in civilian response, which may be poorly organized and underfunded. However, in almost all cases, the civilian organization of response to disaster is improving, including in the field of planning, which lessens the need for help from military forces.
A significant portion of a good emergency plan will provide instructions on how to relay information to the general public. The role of, and tasks allotted to, a spokesperson may need to be defined. In democratic countries, the mass media are expected to have a role that is independent of government, but also to bear a sense of responsibility that induces them to provide public service information in times of crisis. Generally, emergency plans can specify the arrangements for working with the media, but they cannot fully coopt the media as if they were public servants. In news services, a degree of editorial independence is necessary, in order to draw attention to any abuses of office committed by members of a government, or, for that matter, emergency responders.
Increasingly, response to the threat and impact of disaster is a matter of human rights. There are many ways in which this is true. For example, the safety and well being of girls and women need to be ensured in disaster, as well, of course, as at all other times. Disaster should not be an opportunity for abuses to be committed, or for discrimination against women. Emergency planning can also contribute to human rights, for example, by embodying the principle of “design for all” that seeks to ensure that people with disabilities are not forgotten, discriminated against, or abused in disaster situations, and indeed, that they are given the assistance they need to give them as much parity as possible with people who do not have disabilities.
In the modern world, disasters have been occasion for forced migration, the imposition of restrictive ideologies, the persecution of minorities, and discrimination against marginalized groups. These are human rights abuses that need to be counteracted.
Forced migration has occurred in the wake of disasters in countries as diverse as Myanmar (formerly Burma), Indonesia, and the United States. In this, the upheaval caused by disaster, and in particular the destruction of housing and livelihoods, has been used as an opportunity to achieve a form of social engineering, by moving people to settle areas deemed less hazardous. A darker form of this is the persecution of minorities, possibly by propelling them into “ghettos” and enclaves. Concurrently, recovery from disaster has occasionally become the opportunity to impose ideologies, as was the case with the introduction of Islamic Sharia law after both the 2004 tsunami in Banda Aceh and the 2009 Padang earthquake in Indonesia. There is little doubt, moreover, that Cyclone Nargis, in 2008 in Myanmar, did nothing to alleviate the persecution of the Muslim Rohingya people by the Burmese junta. Generally, disasters have been associated with the occurrence, and possibly intensification, of marginalization right across the board, from the homeless in Tokyo to rural communities in Zimbabwe, minorities in the United States, and the poor of Latin American cities like Managua and Lima.
At the very least, emergency planners need to ensure that there is nothing in the plans that could be construed as a means of facilitating such abuses. It is as well to remember that the legacy of two world wars was political hostility to emergency planning, which was seen by some politicians as a handmaiden to totalitarianism. This was because the invocation of special powers to deal with emergency situations was viewed as a dangerous development that could easily be subverted toward forms of dictatorship. Fortunately, these fears have diminished over time. They have largely been supplanted by an understanding of the imperatives of natural and technological hazards, with their capacity to retard human and economic development, or even to throw such processes into reverse.
The so-called “disaster cycle” refers to the phases of resilience building, preparation, emergency response, recovery, and reconstruction. A cycle is used because many disasters are recurrent, although not all are truly cyclical. Clearly, emergency and disaster planning refer primarily to the response phase. However, they have some relevance to all the other phases as well. Emergency planning is largely practiced during the risk mitigation, or resilience-building, phase—the calm periods between major adverse events. It must address the preparation phase as well as the response phase, as there is a need to make preparations systematic, especially where there is enough prior warning of impact for this to be accomplished successfully. While recovery planning may be regarded as a separate process from emergency planning, the two go together in that the phases of recovery offer an opportunity to improve general emergency planning and readiness for the next impact.
In most sudden-impact disasters, there is no reason why recovery planning should not begin the day after the event. Having made that point, however, it is important to note that time is socially necessary in recovery. Consultation must take place, and alternative strategies must be investigated. The aim should not be to “bounce back,” but to “bounce forward” to a more resilient society that is able to face up to future disasters by a better combination of resistance and adaptation than existed before the current impact. Recovery from a major disaster can take decades, and during that time socio-economic conditions will change, and so probably will environmental and hazard conditions. A disaster characterized by death, injury, psychological impairment, destruction, damage, and loss of economic activities, assets, and employment will engender a complex aftermath. In this there is much potential for wrong decisions, unless objectives are carefully set, procedures are clearly identified, and there is a consensus about how the process should take place.
Major disasters such as large floods, cyclonic storms, and earthquakes may not only take a large toll of casualties but may also destroy a great deal of housing stock and business premises. This will stimulate a process of providing shelter, which may involve temporary and transitional solutions to the housing problem before permanent reconstruction of building stock can be achieved. In this process, there is, or rather there should be, a social contract that indicates that survivors will endure the privation of temporary or transitional housing, provided it is for a finite and not excessive period of time. In the aftermath of the March 2011 earthquake and tsunami in northeastern Japan, for example, 88,870 houses were damaged, most of them being completely demolished by the waves. Reconstruction will take about seven years, which is a remarkable achievement that has required very intensive planning at the local, regional, and national levels. Moreover, the planned reconstruction has to be secure against future tsunamis; land must be elevated, sea walls must be constructed, and residential areas need to be relocated to higher ground, all on an unprecedented scale.
The example of Japan’s response to the most expensive natural disaster in human history can be contrasted with that of other, less wealthy nations. The impact of disaster must be seen in relation to national wealth and the effect of a catastrophe on a nation’s commerce, trade, and livelihoods. In this sense, when Cyclone Haiyan (known locally as Yolanda) made landfall in the Philippine province of Eastern Visayas in November 2013 , the storm surge, which reached 5 meters in height, was very much like a tsunami and every bit as devastating. Evacuation saved many lives, but 7,300 people nevertheless died and almost 29,000 were injured. In this economic backwater of Philippine life, recovery was slow and patchy. Many survivors received very little assistance, which helped to perpetuate vulnerability. Although evacuation was more successful when the next major cyclone (named Hagupit) struck in December 2014 , many of the reconstructed shelters of poor people living in coastal communities were once again washed away.
One of the most complex and challenging aspects for recovery planners is the rebuilding of critical infrastructure. In the case of the Japanese Sanriku coast, where the 2011 tsunami came on land, much of the infrastructure was completely devastated: roads, railways, and utility distribution networks had to be rebuilt after sustaining a very high level of damage. Critical infrastructure (which also includes sectors like food distribution and banking) can be divided broadly into that of national importance and that of purely local significance. In many cases, resilience in networks is a function of being able to find different routes through the network. However, blockages can be critical, and infrastructure may be peculiarly susceptible to cascading disasters. In these, the consequences of one failure are the cause of others, in a sort of “domino effect.” Thus, the Japanese Tōhoku earthquake and tsunami caused the Fukushima Daiiichi nuclear reactor meltdown and radiation release. The tsunami also caused failures in manufacturing supply chains around the world, as a result of shutting down vehicle production in Japan.
Supply chains are essential to humanitarian operations and emergency responses. Emergency planning for them has two aspects. The first is an element of business continuity. It seeks alternative ways to ensure supplies of goods or services, in order to keep productivity from falling as a result of interruption of normal business. It thus depends on redundancy, which is potentially an expensive quality, as it may require the duplication of assets. This requires planners to determine which assets are critical, and where the destruction or failure of assets may have a critical effect on the whole production cycle. The second aspect of supply-chain planning involves ensuring efficiency in humanitarian supply, such that the forces on the ground are not left bereft of the equipment, goods, and manpower that are needed to tackle the emergency effectively.
Planning to manage the reconstruction of housing involves some difficult choices about who should build what and where. It is important to avoid excessive price rises in the market for building materials. It is also essential to involve local people, the beneficiaries, in the process of designing, constructing, and adapting permanent housing. In some situations, the best housing is built by its users, while in others it is not possible to learn the necessary skills and so contractors must be used, but the designs should respond directly to the users’ needs.
An important matter in reconstruction planning is the extent to which transitional shelter should be provided. If the terrain studies, site urbanization, preparation, and building processes are likely to take years, and if funding for them is short, then it may be necessary to put people in temporary accommodation, usually consisting of prefabs or so-called “barrack houses.” The space allotted per family varies from 10 to 40 square meters. The upper limit is a tacit international standard that comes from the provision of transitional shelter in countries like Italy and Turkey, while the lower limit refers to very basic “bunkhouse” provision for families in rural locations in countries like Indonesia and the Philippines. In Japan, transitional shelters erected after the 2011 tsunami had floor areas of 27–33 square meters, while those in Sichuan, China, constructed after the 2008 Wenchuan earthquake were slightly smaller than 20 square meters in floor area. Hence, the figure tends to be lower in Asian countries, where urban space is limited and populations are large. One risk of transitional housing is that it may reduce the impetus for permanent reconstruction, and thus leave the survivors in limbo for years or decades. The solution lies in both a constant provision of resources for recovery and a transparent, democratic process of achieving it, with ample public participation.
Recovery and reconstruction planning should aim to revive the local area while at the same time making it safer against future disasters. Revival means rebuilding basic facilities, such as housing, infrastructure, and amenities, but it also means ensuring that livelihoods and the local economy are rebuilt. Experience suggests that this is easiest for settlements that are well connected politically and geographically, and hardest for those that are politically, spatially, and economically marginalized. There is a welfare function in recovery from disaster, and this begs the question of what welfare should involve. At its worst, copious but ill-thought-out assistance to a disaster area can bring the population into a state of aid dependency that is bound to end in negative consequences, as the assistance is unlikely to be perpetual. Reviving the local economy can instead create self-sufficiency and tax revenues that help the area revive itself.
The fundamental purpose of welfare is to support people who lack the ability and resources to provide themselves with a minimum acceptable standard of living. Disaster throws this issue into high relief by differentially affecting the poor and needy more than the wealthy. Welfare should not mean largesse, however attractive this may seem to politicians when they remember that disaster victims are also voters. Instead, scarce resources should be utilized to provide a safety net for the most vulnerable people in society, and thus to mitigate the differential effect of disaster.
From these reflections, it should be apparent that there will be parallel processes of planning that have different weights and salience at different points in the cycle of recurrent disasters (Figure 6 ). To ensure a holistic response to the threat of disaster, recovery, and reconstruction, planning should be linked to ongoing emergency planning initiatives and to business continuity planning. Urban and regional planning should have links to all of these processes, because they are all about reducing the risk to development and all about the “hazardousness of place.”
Figure 6. Parallel forms of planning in the sequence of response to, and recovery from, disasters.
In recent decades, there has been a consistent upward trend in the impact of disasters. Rising populations in the areas of greatest hazard, increasing investment in fixed capital in such places, the complexity of global interconnections, and the impact of climate change in producing more extreme meteorological events all conspire to drive this trend. It has propelled disaster management from a recherché concept to a vital discipline, in which there is an increasing process of professionalization. Standards and guidelines for disaster planning do exist, although none has been universally accepted as the basic model. Nevertheless, there is a gathering consensus on what emergency plans should seek to achieve and how they should be structured.
Dealing with disaster is a social process that has environmental and economic ramifications and implications in terms of governance. Emergency planning needs to fit into a comprehensive program of risk reduction, in which structural defenses are built—for example, river levees and sea walls—and non-structural measures are used in a diversified strategy to bring risk under control and reduce the impact of disasters. The non-structural approach includes not only emergency planning and management but also land-use control, public education, and possibly, relocation of the premises that are most at risk.
Emergency planning now has to face up to the challenges of the information age, in which there is much more immediacy to the means of communication. Social media can be used to warn people, collect information from the field, manage public response, answer the public’s questions, and devise new ways of managing the emergency. For example, social media have begun to have an important role in accounting for missing people in disaster. Crowd sourcing and cooperative efforts can be powerful tools in the response to crises and emergency situations. Hence, social media and Internet communications need to be taken into account in emergency planning.
Over the period 2004–2013 , almost two billion people were directly affected by disaster. In 1995 , the Kobe earthquake in Japan was the world’s most costly disaster ever to have occurred, with total losses and costs of US$132.5 billion. The 2011 Tōhoku earthquake and tsunami will easily surpass this. Moreover, enormous potential for casualties and losses exists in the world’s megacities, such as Tokyo, Tehran, and Istanbul. Emergency planning is thus facing a challenge that is very much greater and more complex than it appeared to be in the 1960s, when the first attempts were made to devise a systematic approach to it. Emergency planners will need to be more professional and to benefit from more, and more sophisticated, training. Information technology will play an increasing role in planning. It is already prominent, for instance, in the use of geographic information systems (GISs) to depict hazards, vulnerabilities, and patterns of emergency response. GIS is already an integral part of many emergency plans.
Another challenge of contemporary emergency planning is internationalization. Cross-border disasters are common, and any increase in the size and strength of meteorological disasters will increase their importance. Most emergency planning is designed to cope with local, regional, or at least domestic inputs, but less so international ones, as these tend to be much less predictable. However, it will become increasingly necessary to guarantee international interoperability, common supply chains, reciprocal aid arrangements, and procedures for working together across borders.
Finally, more informed decisions will have to be made about the magnitude of events for which a response needs to be planned. The apparent tendency for climate to drive increases in extreme meteorological events is only one element of a complex picture in which the distributions of magnitudes and frequencies are not accurately known. Resources are too scarce to permit lavish preparations for notional high-impact events that may occur only once in a millennium. However, preparedness does need to raise its sights and tackle larger events than those that can confidently be expected to occur in a decade. Given restrictions on public spending, this will mean achieving efficiencies and reducing waste in emergency response, as well as developing a robust moral philosophy and ethical position on who deserves what in the postdisaster period.
Future emergency plans will be digital creations that are networked, interactive, and dynamically supported by different kinds of media, including real-time filming and photography and networked teleconferencing. One challenge here is to ensure that the increasing dependency on sophisticated electronic algorithms and communications does not create vulnerability in its own right. Discharged batteries and failed networks of electricity supplies can be enough to make information and communications technologies useless at the height of a crisis.
As noted, emergency planning needs to be a cooperative endeavor and, as such, it is bound up with questions of rights, responsibilities, and democratic participation. The plans that work the best have the broadest support. They are also well known to participants and are frequently referred to. Like all of the principal aspects of modern life, emergency planning and management need to be sustainable endeavors. There are two sides to this. One is to ensure that the planning process is continuous, and support for the civil protection system in which it takes place does not wane during the intervals between disasters. Budget cuts can throw valid programs of safety and security into reverse, but disasters are, unfortunately, inevitable events. The other side is the need to integrate emergency planning into the general process of planning to make human life more sustainable. It will therefore require interfaces with climate change adaptation plans and programs of sustainable resource usage. These are significant challenges, and they add up to a process of “mainstreaming” emergency and disaster planning. The alternatives, inefficient and ineffective responses to the threat and impact of disasters, delayed recovery, and vulnerable reconstruction, should not be allowed in any society, rich or poor.
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A. Reflecting on Module Guiding Questions (5 minutes) B. Reviewing Learning Target (5 minutes)
A. Developing Research Questions (10 minutes) B. Choosing Expert Groups (10 minutes) C. Expert Group Work: Videos of Natural Disasters (15 minutes)
A. Launching Independent Reading (15 minutes)
A. Accountable Research Reading. Select a prompt and respond in the front of your Independent Reading journal. | ). requires students to gather information from print and digital sources. As such, this lesson is designed for students to use internet sources to watch a video. Ensure the technology necessary for students to complete the research is available. ). Consider using the Independent Reading: Sample Plans if you do not have your own independent reading review routines (see the ).
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Key: Lesson-Specific Vocabulary (L); Text-Specific Vocabulary (T); Vocabulary Used in Writing (W)
credible, affect, experience, relevant (L)
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Each unit in the 3-5 Language Arts Curriculum has two standards-based assessments built in, one mid-unit assessment and one end of unit assessment. The module concludes with a performance task at the end of Unit 3 to synthesize their understanding of what they accomplished through supported, standards-based writing.
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and remind students that in the previous lesson they were introduced to the guiding questions for the module. Review the anchor chart. and briefly review the characteristic of respect.
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Work Time | Meeting Students' Needs |
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and focus students on the question at the top, telling them that it will be the focus of their research in this unit: and invite students to add them to their (to cause a change in or have an impact on) (to live through)
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and the grouped around the room. Read each sign aloud. 1.Move to the part of the room labeled for the natural disaster you would like to study. 2.Once there, share with the group why you chose that natural disaster. | |
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Disaster, catastrophe, and cataclysm are some English terminologies that describe the severity of adverse events. Civilians, reporters, and professionals often use these terminologies to communicate and report any event’s severity. This linguistic method is the most practical way to rapidly reach all levels of local/regional/national, and international stakeholders during disasters. Therefore, disaster terminologies play a significant role in disaster management. However, attaining the actual magnitude of a disaster’s severity cannot be comprehended simply by using these terminologies because they are used interchangeably. Unfortunately, there is no consistent method to differentiate disaster terminologies from one another. Additionally, no globally accepted standard technique exists to communicate the severity level when disasters strike; one observer’s ‘disaster’ can be another’s ‘catastrophe’. Hence, a nation’s ability to manage extreme events is difficult when there are no agreed terminologies among emergency management systems. A standard severity classification system is required to understand, communicate, report, and educate stakeholders. This paper presents perceptions of people about disaster terminologies in different geographical regions, rankings and differences in disaster lexical and lexicon. It explores how people perceive major events (e.g., the Covid-19 pandemic), and proposes a ranking of disaster terminologies to create a severity classification system suitable for global use.
Introduction.
The linguistic method, which involves using generic terminology such as ‘emergency,’ ‘disaster,’ and ‘catastrophe’, plays a vital role in communicating the severity of natural disasters—events triggered by nature, such as biological, climatological, extraterrestrial, geophysical, hydrological, and meteorological disasters. Within a language community, terminologies serve to convey information and inter-subjective messages. Like all forms of written or oral communication, the meaning of a term (or sentence) carries a message and information from one person to another. The linguistic method represents the oldest and most practical method of communication and reporting during disasters of varying severity levels. It rapidly disseminates information to all levels of stakeholder groups (local, provincial, regional, national, continental, or international). Additionally, it is commonly employed for educational purposes due to its wide-reaching effectiveness.
The need for a common understanding of terminologies to communicate about the severity of an event is essential in disaster situations 1 , as they often require many stakeholders to work together toward a common goal. This need is compounded by the fact that many stakeholders involved in disaster relief may speak different languages and might not fully understand English words such as ‘disaster,’ ‘catastrophe,’ and ‘cataclysm.’ As a result, confusion and breakdowns in communication may occur because some stakeholders might not comprehend the exact meaning of the terminologies being used 2 . Yet, establishing a common understanding of these terminologies is vital to reduce confusion among stakeholders and create a well-understood framework for providing disaster relief. However, for this to happen, policymakers, academics, and practitioners must initiate the process of redefining terminology while simultaneously developing appropriate measures and scales that distinguish each term and its representation of disaster severity.
Similarly, although disasters are not universally understood in the same way 3 , reaching a common understanding—such as a universally agreed-upon approach about what category a disaster falls under–to classify disaster severity is essential 4 in disaster management and disaster risk management. This common understanding is crucial in situations where many stakeholders worldwide come together for a common cause. To initiate this process, English is the most suitable language for classifying natural disasters globally, given its predominance as the most widely spoken and used official language (see Supplementary A online). The disaster terminologies in English are even adapted with modifications when creating severity scales (for both individual and common classification systems, as shown in Supplementary B online) to emphasize the degree of impact an event has 5 . When an acceptable point of reference exists within a globalized language (i.e., a guideline or standard criterion) to classify disasters, it can be adapted to any particular language through translation and standard colour and number coding, as described in Section “ Limitations and future extensions ”.
Due to inconsistency in how stakeholders perceive various terminologies, the lack of agreed terminology poses a global challenge in formulating legislation and policies regarding disaster response 6 . Failing to identify a potential hazard during disaster communication can lead to devastating consequences 7 . For example, Hurricane Katrina’s devastating impacts were exacerbated by an ineffective government response and a failure to recognize the severity of the situation 8 . Another example is the series of decision-making errors that compounded disaster relief efforts during the 2004 Indian Ocean tsunami. These errors contributed to the Indian Ocean Tsunami becoming one of the world’s deadliest natural disasters, resulting in approximately 230,000 deaths and leaving over a million homeless in 14 countries. For instance, in India, word of the disaster went to the wrong official 9 . With no warning, coastal populations were caught off guard by the immense waves from the tsunami. The lack of communication was made worse because officials did not recognize or adequately classify the severity of the event. Consequently, coastal residents, tourists, and governments did not know the tsunami’s severity, so they did not effectively respond to the disaster 10 . In addition, inconsistent identification of disaster impacts results in overcompensation or under-compensation in assigning resources for mitigation 11 . Overcompensation may waste resources, while under-compensation could increase the impact severity. Properly and promptly identifying the disaster impact is crucial because lives depend on these decisions 12 .
These examples make it imperative that a standard severity classification system is required to understand, communicate, report, and educate stakeholders during a disaster, including in both the pre- and post-disaster period. Moreover, these natural phenomena have no national boundaries when they strike. The impacts of a disaster in a region, if not managed properly, can produce political and social instability, and affect international security and relations 13 . The recent Covid-19 pandemic is a good example of these consequences. A common communication platform for disaster severity is therefore needed to convey vital information in a standard format that a global audience understands.
Selecting specific terminologies, even within the English language, to represent varying levels of severity for a global audience is a challenging task that demands careful consideration. This challenge arises because the terminology we employ is not universally understood. The lexicon (dictionary) meaning and the lexical (verbal) meaning of these terminologies can vary based on factors such as time/era, location, individual experience, and situation (see Supplementary C online). Although the severity scales mentioned in Supplementary B online are developed using the linguistic method to categorize the different levels of severity, in all but the two common scales, the proposed labeling appears to be arbitrary, particularly in all individual and common scales. The two scales, Fatality-Based Disaster Scale 14 and Universal Disaster Severity Classification 15 , paid some attention when selecting the terminologies to label the levels of severity; however, they did not consider the current views of the people who are going to use these scales. Proposing a clear definition and criteria for disaster terminologies is important, but people often do not refer to the definition, especially in disaster situations, and they assume the lexical (verbal) meaning of the word. Therefore, it is important to consider the users’ perspectives when selecting labels/terminologies for unification to categorize disaster severity levels.
This research aims to propose a universal classification framework for defining disaster severity regardless of the geographical location of the disaster and the linguistic, lexical, and semantic nuances that can affect the interpretation of terminology. Moreover, the focus of this universal disaster framework will be measured specifically in terms of the adverse effects the event has on a community or an environment and not the degree of severity it has on an individual.
The terminologies that describe the magnitude of a natural phenomenon, including calamity, cataclysm, catastrophe, disaster, and emergency, were selected for investigation. The aim was to determine whether significant differences exist in the seriousness levels among these terms or if people perceive them as synonyms and use them randomly. The term ‘Armageddon,’ which describes “a usually vast decisive conflict or confrontation” or “a terrible war that could destroy the world” 16 , was excluded from consideration due to its relevance to human-caused catastrophes rather than natural events. Similarly, the term ‘apocalypse’ was excluded from the analysis due to its religious connotations, as some religious beliefs associate it with the destruction or end of the world.
Surveys have been conducted to investigate people’s perceptions of natural disaster terminologies and how they utilize these terms to indicate the severity levels of an event using a case study. The primary objective of these surveys was to determine whether differences exist in ranking disaster terminologies among individuals. The research question addressed was: Are there any differences in the ranking of disaster terminologies among people? The hypothesis posited is that there are no differences in the ranking of disaster terminologies among people. Therefore, the independent variables in this study were the disaster terminologies, and the dependent variable was the respondents’ rankings of the disaster terminologies. These surveys were approved by the University of Calgary Conjoint Faculties Research Ethics Board.
To examine the previous research question, two web-based surveys were conducted. All five terminologies (calamity, cataclysm, catastrophe, disaster, and emergency) were presented in alphabetical order to each respondent. Subsequently, the respondents were asked to rank the five terminologies based on their understanding of the term’s severity level, ranging from the lowest (Level 1) to the highest (Level 5). Respondents were not allowed to assign the same rank to two different terminologies within these surveys. The first survey, conducted from August 2015 to December 2020, involved presenting the terminologies without providing their definitions, resulting in rankings based on lexical (verbal) meaning. In the second survey (conducted from September 2020 to June 2021), respondents were given the definitions from the Oxford dictionary, resulting in rankings based on lexicon (dictionary) meaning. The study seeks to rank the severity of disaster terminologies for global audiences who typically rely on dictionary definitions rather than disaster literature when referencing meanings. It is noteworthy that none of the disaster literature, except for the literature related to the continuation of this research, provides definitions for all five terms considered in this study. Consequently, the current definitions from the Oxford English Dictionary for the aforementioned five terms are presented to the respondents to ensure consistency in the analysis. During the second survey, respondents were also queried about the single terminology they would use to describe the ongoing Covid-19 pandemic. Additionally, real-time Covid-19 statistics, including global confirmed cases, global deaths, and global recovered cases, were presented to the respondents while answering this question.
Web-based international surveys were conducted to provide access to large and geographically dispersed populations cost-effectively and efficiently. These web surveys were launched on the Alchemer platform (formerly known as SurveyGizmo) to reach participants globally. As this study was conducted in English, the target population comprised English-speaking adults aged 18 years or older who were internet users, amounting to fewer than 1 billion people. Approximately 1.4 billion out of 7.8 billion people spoke English, with around 26% of the global population being under 15 years of age 17 . Additionally, there were 4.914 billion active internet users worldwide, constituting 63% of the global population in 2021 18 . The survey was designed as an international web-based survey due to its focus on the adult English-speaking population (aged 18 and above). While no subgroups were identified within the global population analysis, subgroups were considered for geographical areas, such as the six populated continents. A general statistical guideline suggests that approximately 30 participants are needed in each group 19 . However, the sample size requirement for non-parametric tests was 1.15% of the parametric test’s sample size 20 . Consequently, a sample size of about 242 was necessary to represent all continents in non-parametric tests.
In this study, non-probabilistic sampling techniques are employed because the research focuses on the entire population of English-speaking adult internet users, a group too vast to be comprehensively examined. The study aims to establish a ranking suitable for a global audience, rendering it impractical to utilize random probability sampling, which would grant each population member a known (or equal) chance of participation. Consequently, a combination of convenience sampling (recruiting readily available and willing participants) 19 and snowball sampling (recruiting participants through existing participants) 19 was employed to gather respondents. Potential survey participants were invited through both professional and personal networks, including contacts gathered from the 3rd United Nations World Conference on Disaster Risk Reduction. Survey links were disseminated through various means, including emails, short message services, social media platforms (such as Facebook and LinkedIn), newsletters (e.g., the e-PEG newsletter of the Association of Professional Engineers and Geoscientists of Alberta, and the electronic newsletter of the World Federation of Engineering Organizations—Committee on Disaster Risk Management), websites, online discussion platforms (such as Catastrophe Indices and Quantification Inc. (CatIQ), and the Canadian Risk and Hazards Network (CRHNet)), and by distributing handouts at conferences (including the 12th and 13th Annual CRHNet Symposiums, the 5th International Natural Disaster Mitigation Specialty Conference of the Canadian Society for Civil Engineering, the 12th International Conference of the International Institute for Infrastructure Resilience and Reconstruction, and the Canadian Catastrophe Conference of the CatIQ).
Since the study was based on ordinal data (ranking/ordering values) 20 , it was better suited for representation by the median rather than the mean. Consequently, non-parametric tests were employed. The preference for the median over the mean stemmed from the skewed distribution nature of the study. The median better captures the center of the distribution, signifying that 50% of the values lie above it while 50% lie below. For instance, consider a scenario where most individuals assign higher rankings to a particular term, and very few assigns lower rankings (resulting in a few outliers) to that same term. In such cases, the mathematical mean may decrease even though the median remains stable. In situations where the distribution is significantly skewed, extreme values in the distribution’s tail can substantially affect the mean. Conversely, the median remains a more robust indicator of the distribution’s center.
In these surveys, the five samples of each terminology are interconnected, as respondents were unable to assign the same rank to two different terminologies. As a result, the ranks received for the five terminologies were interdependent. The non-parametric tests below 21 were conducted to address the following hypotheses:
The Friedman test was employed to determine whether people utilize these five terminologies randomly or if there exists a significant difference in the ranking of each terminology.
There is no significant difference between the mean ranks of the disaster terminologies.
If the ranks were not randomly distributed, Kendall’s W Test was performed to ascertain the agreement between respondents’ rankings.
There was no agreement among the respondents in ranking different terminologies (W = 0).
In cases where agreement among respondents’ ranking was observed, the Wilcoxon signed-rank test was conducted for each pair of terminologies. This aimed to identify terminologies with differing rankings and terminologies showing similar rankings, shedding light on peoples’ ranking of these natural disaster terminologies. Further details about the Wilcoxon signed-rank test are available in Supplementary D online.
The median difference (M A - M B ) was equal to zero. For instance: H 0 : M Cataclysm − M Calamity = 0.
To gauge public perceptions of commonly used severity terminologies, an initial survey collected 1170 responses. However, only 624 respondents (approximately 54%) completed rankings for all five terminologies based on their lexical (verbal) meanings. Notably, many respondents omitted rankings for ‘cataclysm’ or ‘calamity’ compared to the other three terminologies. ‘Emergency,’ ‘disaster,’ and ‘catastrophe’ were more widely recognized, likely due to their prevalence in governmental and insurance-related contexts, while ‘calamity’ and ‘cataclysm’ were viewed as more colloquial 15 . Some respondents may have refrained from ranking these terminologies due to their perceived subjectivity, favouring a more objective approach to assessing disaster severity. The initial assumption that ‘emergency,’ ‘disaster,’ ‘calamity,’ ‘catastrophe,’ and ‘cataclysm’ represent a perceived hierarchy of seriousness among disaster terminologies was derived from the frequency of completed survey rankings (see Fig. 1 ).
Frequency distribution of respondents’ rankings (from 1 to 5) for natural disaster terminologies.
Based on the two-survey analysis (see Supplementary E online), Table 1 compares respondents’ rankings of disaster terminologies with and without the respective terminology’s definitions. In the global sample, the absence of the terminology’s definitions (i.e., lexical (verbal) meaning) resulted in four distinct levels of ranking for ‘emergency,’ ‘calamity,’ ‘disaster,’ and ‘catastrophe/cataclysm.’ However, when the definitions of the terminologies were provided (i.e., lexicon (dictionary) meaning), respondents did not differentiate between terminologies with more than two levels, specifically ‘emergency/calamity’ and ‘disaster/catastrophe/cataclysm.’ Similarly, for North Americans and Asians, the absence of terminology definitions led to clear differentiation among ranks, creating three distinct levels: ‘emergency,’ ‘calamity/disaster,’ and ‘catastrophe/cataclysm.’ However, with the presence of definitions, they did not differentiate terminologies with more than two levels. Additionally, Oceania respondents, who exhibited two distinct levels without the presence of disaster terminology definitions, showed only one level when definitions were provided (i.e., they randomly ranked the five terminologies). Europeans maintained the same rankings with or without definitions. However, it is important to note that the European and Oceania continents might not have yielded accurate results due to insufficient data (n < 60) for the Wilcoxon signed-rank test. Nevertheless, a clear differentiation between respondent rankings for lexicon (dictionary) meaning and lexical (verbal) meaning was evident among the global, North American, and Asian respondents.
The summary of the results in Supplementary E online and “ Analysis of perception about natural disaster terminologies ” section can be outlined as follows: Firstly, there is a consensus among global respondents regarding the representation of severity order for disaster terminologies in both their lexical (verbal) and lexicon (dictionary) meanings. Similarly, North Americans, Asians, and Europeans share a common perspective on the severity order representation of disaster terminologies for their lexical (verbal) and lexicon (dictionary) meanings. However, for Oceania respondents, agreement is observed only in the lexical (verbal) meaning, not in the lexicon (dictionary) meaning. In essence, an agreed-upon order of seriousness exists rather than random usage of these terms. Secondly, a slight variation exists in the understanding of these terminologies based on the geographical locations of English speakers, particularly in their lexical (verbal) meaning. Nonetheless, such differences are not significant when it comes to the lexicon (dictionary) meaning. In other words, the inclusion of definitions can lead to a general agreement among people, reducing the variance in the severity order representation based on geographical regions. Thirdly, a distinction is evident in perceptions about the order of severity for disaster terminologies between their lexical (verbal) meaning and their lexicon (dictionary) meaning. While a clear differentiation across four severity levels existed for lexical (verbal) meaning, the differentiation was limited to two levels for lexicon (dictionary) meaning. The provided disaster definitions (Oxford Dictionary definitions) did not facilitate differentiation among the disaster terminologies 22 , 23 . The analysis underscores that these provided definitions did not enhance understanding; rather, they introduced further confusion. Consequently, if these terminologies are to be employed for distinguishing severity levels within a standard classification system, precise definitions for each disaster terminology are imperative.
Understanding the usage of disaster terminologies and how global respondents employ them in disaster situations is crucial, particularly when integrating them into a global severity classification system encompassing all types of disasters. In general, it is anticipated that global respondents comprehend and utilize the terminology accurately, and their classifications shift as the severity of an event changes. Within this context, a widespread understanding of disaster terminologies can be inferred. Consequently, these terminologies can be leveraged to delineate severity levels within a global severity classification system, provided that precise definitions are established to enhance people’s comprehension. To examine the hypothesis about how global respondents employ disaster terminologies to convey the severity of an event, a significant event characterized by its diffusion across space and time becomes a more suitable subject for analysis.
The Covid-19 pandemic, which originated in Wuhan, China, in December 2019, swiftly evolved from an endemic to an epidemic, eventually reaching global pandemic status within months. As of March 10, 2023, the pandemic has resulted in over 676.6 million confirmed cases and 6.8 million reported fatalities globally 24 , with new cases reported daily. Covid-19’s far-reaching impact, profoundly affecting various aspects of life worldwide from fatalities to financial crises, makes it a compelling example for this study. To understand public perceptions of major events, an investigation into individuals’ perceptions of the Covid-19 pandemic was conducted.
During the pandemic, a second survey was conducted to assess respondents’ choice of terminology to describe Covid-19’s severity. Respondents selected a single terminology from five options, with real-time Covid-19 statistics provided alongside. Out of 848 respondents, 674 (79.5%) chose one of the five terminologies to describe Covid-19’s severity. The majority described it as a disaster, followed by catastrophe, and emergency (see Fig. 2 ).
Frequency distribution of people’s perceptions regarding the ongoing Covid-19 pandemic.
Respondents’ perceptions of Covid-19 may have shifted due to its increasing impact. The analysis of respondents’ choices over time revealed that each terminology displayed initial randomness in 2020, followed by a stable pattern emerging in the first half of 2021, and subsequently showed an upward trend for disaster and catastrophe and a downward trend for calamity, cataclysm, and emergency (see Fig. 3 ).
Change in perception about the ongoing Covid-19 pandemic.
This shift coincided with the designation of variants of concerns (VOCs) (see Fig. 3 and Table 2 ). With the designation of Alpha and Beta variants, there was a gradual increase in describing Covid-19 as an emergency, calamity, disaster, and cataclysm, while labeling it as a catastrophe decreased. By January 2021, with the designation of the Gamma variant and total confirmed cases surpassing 100 million, with over two million fatalities, respondents consistently applied a variety of labels to the pandemic. Post-April 2021, as the Delta variant emerged and total confirmed cases surpassed 150 million, with over three million fatalities, the trend shifted towards identifying Covid-19 as a disaster or catastrophe, with a decrease in labeling it as an emergency, calamity, or cataclysm. By the survey’s end in June 2021, 50% of respondents characterized Covid-19 as a disaster, 33.3% as a catastrophe, and the remainder as an emergency; none used calamity or cataclysm. Throughout the survey period, the usage of calamity or cataclysm remained low compared to disaster, catastrophe, and emergency.
This case study provides valuable insights into how individuals reference major events and how their perceptions evolve with changing circumstances. As the severity of Covid-19 rapidly increased during the first four months of 2021, reaching over 0.1 to 0.2 billion global confirmed cases and over 2 to 3 million fatalities, people’s choice of terminology became more stable. Their preferences shifted towards terms indicating a higher order of seriousness rather than those with lower levels. As the severity of the pandemic continued to escalate, surpassing 0.2 billion global confirmed cases and 3 million fatalities, people’s usage of terms decreased for those with lower levels of seriousness, while there was an increase in the usage of terms indicating higher levels of severity. This suggests that individuals globally possess a general understanding of disaster terms, and their utilization of these terminologies is guided by their comprehension of the hierarchy of seriousness and events’ severity levels. Therefore, these terminologies can effectively define severity levels within a global classification system, contingent upon establishing precise definitions that enhance people’s comprehension.
Integrating descriptive terminologies within an emergency management system enhances mutual understanding and simplifies management, minimizing confusion. For instance, using terminologies with escalating severity levels such as ‘emergency,’ ‘disaster,’ and ‘catastrophe’ as descriptive headings aligns with increasing severity, rather than only employing headings like ‘Type 1,’ ‘Type 2,’ or ‘Type 3.’ This approach helps to avoid ambiguity regarding whether Type 1 or Type 5 holds greater significance, as it does for Incident Management Teams Typing (IMTs), a classification used by disaster managers and emergency responders 25 , 26 . Consequently, a universal linguistic approach that integrates existing severity classification systems becomes imperative. However, the selection of appropriate terminologies for distinct severity levels should be undertaken with meticulous evaluation 15 .
Based on “ Analysis of perception about natural disaster terminologies ” section and Supplementary C and E online, the order of seriousness for the current dictionary definitions, etymological definitions, and people’s perceptions of natural disaster terminologies is presented in Table 3 . This order is being proposed to establish a hierarchy of seriousness for the considered terminologies, tailored specifically for a global audience. As previously mentioned, ‘apocalypse’ is unsuitable for representing severity levels for global audiences due to its religious bias. When determining this order, greater importance was given to the sequence of lexical (verbal) meanings (Column 4 in Table 3 ) compared to the lexicon (dictionary) meanings (Column 5 in Table 3 ), as perceived by individuals. This differentiation stems from the fact that the intended order of seriousness is meant for a worldwide audience, where people generally understand a term’s lexical (verbal) meaning without necessarily referring to the provided lexicon (dictionary) meaning. Consequently, the suggested sequence is as follows: emergency, calamity, and disaster for Levels 1, 2, and 3, respectively. However, both catastrophe and cataclysm are placed at the same level based on the convergence of people’s perceptions regarding the lexical (verbal) and lexicon (dictionary) meanings. Nonetheless, when considering the overall mean rank order obtained from respondents’ rankings (as depicted in Fig. 1 and Supplementary Table S6 online), catastrophe and cataclysm are recommended for Levels 4 and 5, respectively. Therefore, based on the analysis of both lexical (verbal) and lexicon (dictionary) meanings, the proposed sequence of the five terminologies from lowest to highest seriousness is as follows: emergency, calamity, disaster, catastrophe, and cataclysm. This arrangement is not arbitrary; it is substantiated by the data and reflects the contemporary viewpoints of individuals on a global scale. Consequently, this sequence is well-suited for a global audience, and these designations effectively function as categories within a comprehensive global severity classification system.
To establish a universally accepted method of communicating disaster severity levels using a linguistic approach, we have applied the aforementioned proposed order of disaster terminologies to the Qualitative Universal Disaster Severity Classification (QUDSC) developed by Caldera and Wirasinghe 27 , incorporating certain modifications. The selection of QUDSC for this application is primarily attributed to five key factors as described in Supplementary F online.
Table 4 presents Advanced Qualitative Universal Disaster Severity Classification (AQUDSC), a comprehensive system for categorizing all types of natural disasters across stakeholder groups. Five modifications have been introduced to the existing QUDSC. Firstly, the order of seriousness for terminologies has been adjusted, incorporating ‘emergency,’ ‘calamity,’ ‘disaster,’ ‘catastrophe,’ ‘cataclysm,’ and ‘partial or full extinction’ aligning with the general understanding of the global audience as analysed above. Secondly, each level is now assigned a name and definition to create a complete 0–10 level system, including the addition of ‘Emergency Level 1’ to maintain consistency with sub-levels. Thirdly, ‘Type 1’ and ‘Type 2’ terms have been replaced by ‘Level 1’ and ‘Level 2’ to enhance clarity with hierarchical connotation. Fourthly, the definition of ‘emergency’ has been revised to accommodate disasters without human fatalities but substantial damage. Lastly, colour-coding has been adjusted to maintain consistency and aid memorization, with each term assigned a unique color: blue for ‘Emergency,’ green for ‘Calamity,’ yellow for ‘Disaster,’ red for ‘Catastrophe,’ gray for ‘Cataclysm,’ and black for ‘Partial or Full Extinction.’ Lower levels represent light colours, while upper levels represent dark colours. These modifications aim to enhance clarity and facilitate disaster management across all levels (see Supplementary G online for more details).
The QUDSC was used to create the Initial Universal Disaster Severity Classification (IUDSC) 27 . Subsequently, adjustments were made to the IUDSC to align with the AQUDSC. The resulting Modified Universal Disaster Severity Classification (MUDSC) is presented in Table 5 . These modifications have led to improvements to the QUDSC/IUDSC:
The ranking of disaster terminologies in AQUDSC/MUDSC is suitable for a global audience, as it considers the general understanding and lexical (verbal) meaning of users.
AQUDSC/MUDSC comprehensively represents the complete range of severity including disasters that lack direct fatalities but cause significant damage to communities, such as the 2016 Fort McMurray fire.
The system provides a clear labeling strategy to distinguish each level without causing confusion about their respective criticality. Additionally, a consistent colour-coded system facilitates broader communication between the public, emergency services, and media organizations, enabling easy adaptation for any language, country, or culture.
Therefore, AQUDSC/MUDSC enhances the differentiation of disaster severity levels for the global audience, offering a clear understanding of severity along the disaster continuum.
AQUDSC/MUDSC provides standardized terminologies and clear definitions for a global audience to describe the impact of natural disasters. Standardized definitions have significant implications, as outlined in the Technical Report on Hazard Definition and Classification Review 2020 28 . Clear definitions facilitate effective measurement and reporting of risks, thereby contributing to the development of appropriate disaster risk management measures and long-term planning. Standardization supports all aspects of risk management, including multi-hazard risk assessments, warnings and alerts, disaster response and recovery, long-term planning, and public awareness efforts. Furthermore, standardized definitions form the foundation for a uniform database of loss data and information, which makes a valuable contribution to forecasting future events. With consistent, standardized definitions and global-scale risk information, communities at local and national levels can determine the most effective strategies for mitigating the impacts of future events.
MUDSC serves as a global severity classification system for post-event assessment, accommodating various natural events irrespective of the disaster type, location, or occurrence time. It allows for the evolution of severity classifications over time as reports on impacts are updated, aiding responders, and informing public planning and relief efforts. Additionally, it is a comprehensive tool to describe, measure, categorize, compare, assess, rate, and rank the impact of various natural events, ranging from a lightning strike to a super volcanic eruption. Thus, MUDSC simplifies impact assessments, enhances disaster preparedness, and facilitates multi-hazard management by offering a unified classification for regions prone to multiple disasters.
MUDSC enhances warning communications by employing plain language to categorize disasters, ensuring the public comprehends the severity and urgency of evacuation. Plain language communication of warning indications ensures mutual understanding between emergency management systems and the general public. Populations are most sensitive to disasters with high human impacts 7 , and MUDSC explicitly establishes a direct relationship between a disaster and its human impacts. Employing MUDSC for preparedness and mitigation methods, including public awareness campaigns, disaster education, and disaster drills, helps reshape public opinion, capturing the public’s attention and fostering trust and response rates to warnings, minimizing fatalities and injuries during disasters. Its integration into multi-hazard early warning systems contributes to achieving Sendai Framework targets, specifically Target G 29 .
MUDSC enhances disaster preparedness and management globally by providing standardized severity levels. Its implementation is expected to eliminate inconsistencies, facilitate mutual communication among stakeholders, and assess the need for regional, national, and international assistance in managing global disasters. Additional detailed descriptions regarding the significance of the proposed AQUDSC/MUDSC are available in Supplementary H online.
AQUDSC and its application version, MUDSC, were developed to provide a common language for communicating the severity of natural disasters globally. This system aims to facilitate easier communication and management at all levels by selecting appropriate terminologies and using plain language to describe the magnitude of a disaster’s impact, considering the general public’s perception of disaster terminology.
The main advantage of the MUDSC is its ability to provide a standardized method for comparing natural disasters. It allows for the quantitative and qualitative description, measurement, categorization, comparison, assessment, rating, and ranking of a wide range of natural disasters occurring anywhere in the world. The system covers disasters resulting from various types of events, including those that are diffuse in space and time as well as events with less clear start and endpoints, such as droughts, pollution, and epidemics. It also encompasses conditions that could lead to extinction events or massive phenomena, such as super volcanoes or meteoroid impacts. Furthermore, by facilitating multi-hazards management, disaster risk reduction, and preparedness at all levels and within/across all sectors, MUDSC aligns with the goals of the Sendai Framework.
Importantly, the AQUDSC/MUDSC serves as a common categorization system for all stakeholder groups involved in disaster management and response, including civilians, emergency responders, disaster managers, relief agencies, international/regional/national/local government entities, non-governmental organizations, media, insurance managers/estimators, academics, researchers, and policymakers. By offering a comprehensive view of disaster severity, the system aids in public education, assessment purposes, and decision-making for resource allocation, mitigation, and recovery efforts.
Overall, the AQUDSC/MUDSC is expected to establish a universal standard severity classification system that promotes mutual understanding among different countries’ emergency management systems, eliminates inconsistencies, and provides a common language for describing the impact of disasters worldwide.
Informed consent was obtained from all participants before data collection. Consents were granted only for the inclusion of group information in any presentation or publication of results. Please note that the dataset was collected following the Tri-Council Policy Statement: Ethical Conduct for Research Involving Humans 2010 (TCPS 2) and the University of Calgary Guidelines. Ethics approval was granted under certificate ID REB15-0031 and modification ID REB15-0031_MODI for additional questions added to the questionnaire using Covid-19 as a case study.
This ongoing research project aims to develop an advanced multidimensional Universal Disaster Severity Classification System (UDSCS) to comprehensively assess the disaster continuum both qualitatively and quantitatively 61 . The paper introduces an AQUDSC/MUDSC for global comparison of various natural disasters’ impacts. Initially focusing on fatalities alone, MUDSC’s limitation prompted the need for a multidimensional quantitative scale incorporating influential factors like fatalities and damage costs using a disutility function 30 .
The analysis explores the disparity between perceived severity and actual impact, demonstrating the dynamics of community communication. However, the non-random and restricted sample, especially in linguistically diverse regions, may result in deviations in severity perception. Covid-19 serves as an illustrative case study due to its global impact and evolving severity, although perceptions of epidemics and pandemics differ from other disasters. Consequently, there might be disparities in the perception of event severity.
The provided definitions and criteria in AQUDSC offer guidance for adapting the classification to different languages, aiming for equivalence in meaning rather than exact word translations. Future language adaptations may involve proposing suitable terminologies by bilingual experts, followed by surveys to select the most appropriate terms. However, this adaptation process falls beyond the current research scope and remains a potential avenue for future studies.
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The authors would like to thank Professor Emeritus R. B. Bond for his guidance, input, and comments on the disaster terminology section of this paper. The authors also thank all the respondents of the survey and those who assisted in distributing it worldwide. This research was funded in part by the Natural Sciences and Engineering Research Council of Canada, Alberta Innovates—Technology Futures, Alberta Motor Association, the University of Calgary, the Catastrophe Indices and Quantification Incorporated, the Canadian Risk Hazard Network, and the Ministry of Culture and Status of Women, Government of Alberta.
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Caldera, H.J., Wirasinghe, S.C. Evolution of natural disaster terminologies, with a case study of the covid-19 pandemic. Sci Rep 14 , 14616 (2024). https://doi.org/10.1038/s41598-024-64736-8
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