A disaster is a serious problem occurring over a short or long period of time that causes widespread human, material, economic or environmental loss which exceeds the ability of the affected community or society to cope using its own resources. Disasters are routinely divided into either "

natural disasters A natural disaster is "the negative impact following an actual occurrence of natural hazard in the event that it significantly harms a community". A natural disaster can cause loss of life or damage property, and typically leaves some econo ...

" caused by natural hazards or "human-instigated disasters" caused from anthropogenic hazards. However, in modern times, the divide between natural, human-made and human-accelerated disasters is difficult to draw. Examples of natural hazards include avalanches, flooding, cold waves and heat waves, droughts,

earthquakes An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...

cyclones In meteorology, a cyclone () is a large air mass that rotates around a strong center of low atmospheric pressure, counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere as viewed from above (opposite to an anti ...

, landslides, lightning, tsunamis, volcanic activity, wildfires, and winter precipitation. Examples of anthropogenic hazards include criminality,

civil disorder Civil disorder, also known as civil disturbance, civil unrest, or social unrest is a situation arising from a mass act of civil disobedience (such as a demonstration, riot, strike, or unlawful assembly) in which law enforcement has difficulty ...

, terrorism, war, industrial hazards, engineering hazards, power outages, fire, hazards caused by transportation, and environmental hazards. Developing countries suffer the greatest costs when a disaster hits – more than 95% of all deaths caused by hazards occur in developing countries, and losses due to natural hazards are 20 times greater (as a percentage of gross domestic product) in developing countries than in

industrialized countries A developed country (or industrialized country, high-income country, more economically developed country (MEDC), advanced country) is a sovereign state that has a high quality of life, developed economy and advanced technological infrastruct ...

Etymology

The word ''disaster'' is derived from Middle French ' and that from Old Italian ', which in turn comes from the Ancient Greek pejorative prefix - (''-'') "bad" and ('), "star". The root of the word ''disaster'' ("bad star" in Greek) comes from an astrological sense of a calamity blamed on the position of planets.

Classification

Disasters are routinely divided into natural or human-made. However, in modern times, the divide between natural, man-made and man-accelerated disasters is quite difficult to draw. Complex disasters, where there is no single root cause, are more common in developing countries. A specific disaster may spawn a secondary disaster that increases the impact. A classic example is an earthquake that causes a tsunami, resulting in coastal flooding, resulting in damage to a nuclear power plant (such as the Fukushima nuclear disaster). Some manufactured disasters have been wrongly ascribed to nature, such as

smog Smog, or smoke fog, is a type of intense air pollution. The word "smog" was coined in the early 20th century, and is a portmanteau of the words ''smoke'' and '' fog'' to refer to smoky fog due to its opacity, and odor. The word was then inte ...

and

acid rain Acid rain is rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions (low pH). Most water, including drinking water, has a neutral pH that exists between 6.5 and 8.5, but acid ...

. Some researchers also differentiate between recurring events, such as seasonal flooding, and those considered unpredictable.

Natural disasters (caused by natural hazards)

Human-instigated disasters (caused by anthropogenic hazards)

UA Flight 175 hits WTC south tower 9-11 edit

Human-instigated disasters are the consequence of technological or human hazards. Examples include war, social unrest, stampedes, fires,

transport accidents A transport accident is any accident (or incident) that occurs during any type of transportation, including accidents occurring during road transport, rail transport, marine transport and air transport. It can refer to: *a road traffic accident ...

, industrial accidents, conflicts, oil spills, terrorist attacks, and nuclear explosions/ nuclear radiation. Other types of induced disasters include the more cosmic scenarios of catastrophic climate change,

nuclear war Nuclear warfare, also known as atomic warfare, is a theoretical military conflict or prepared political strategy that deploys nuclear weaponry. Nuclear weapons are weapons of mass destruction; in contrast to conventional warfare, nuclear w ...

, and bioterrorism. One opinion argues that all disasters can be seen as human-made, due to human failure to introduce appropriate

emergency management Emergency management or disaster management is the managerial function charged with creating the framework within which communities reduce vulnerability to hazards and cope with disasters. Emergency management, despite its name, does not actuall ...

measures.Blaikie, Piers, Terry Cannon, Ian Davis & Ben Wisner. ''At Risk – Natural hazards, people's vulnerability and disasters'', Wiltshire: Routledge, 2003,

Famine A famine is a widespread scarcity of food, caused by several factors including war, natural disasters, crop failure, Demographic trap, population imbalance, widespread poverty, an Financial crisis, economic catastrophe or government policies. Th ...

s may be caused locally by drought, flood, fire, or pestilence, but in modern times there is plenty of food globally, and sustained localized shortages are generally due to government mismanagement, violent conflict, or an economic system that does not distribute food where needed. Earthquakes are mainly hazardous because of human-created buildings and dams; avoiding earthquake-generated tsunamis and landslides is largely a matter of location.

Responses

The following table categorizes some disasters and notes first response initiatives.''Business Continuity Planning (BCP): Sample Plan For Nonprofit Organizations.''
Pages 11-12. Retrieved 8 August 2012.

References

External links

List of Disasters at ReliefWeb
of the United Nations Office for the Coordination of Humanitarian Affairs
The Disaster Roundtable
of the

National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the Nati ...

EM-DAT International Disaster Database
of the Centre for Research on the Epidemiology of Disasters
Global Disaster Alert and Coordination System
– The Global Disaster Alert and Coordination System is a joint initiative of the United Nations Office for the Coordination of Humanitarian Affairs (OCHA) and the European Commission
UN-SPIDER
– UN-SPIDER, the United Nations Platform for Space-based Information for Disaster Management and Emergency Response], a project of the United Nations Office for Outer Space Affairs (UNOOSA) {{Authority control