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==Geological disasters==
==Geological disasters==
===Avalanches=
===Avalanches===
{{main|List of avalanches}}
During World War I, an estimated 40,000 to 80,000 soldiers died as a result of avalanches during the mountain campaign in the Alps at the Italian Campaign (World War I)Austrian-Italian front, many of which were caused by artillery fire.<ref>Lee Davis (2008).
{{see also|Avalanche}}
[[Image:Lawine.jpg|thumb|right|A [[Snow|powder snow]] avalanche]]
During [[World War I]], an estimated 40,000 to 80,000 soldiers died as a result of avalanches during the mountain campaign in the [[Alps]] at the [[Italian Campaign (World War I)|Austrian-Italian]] front, many of which were caused by artillery fire.<ref>Lee Davis (2008). "''[http://books.google.com/books?id=CRzMOYIuLJEC&pg=&dq&hl=en#v=onepage&q=&f=false Natural Disasters]''". Infobase Publishing. p.7. ISBN 0816070008</ref>


===Earthquakes===
===Earthquakes===
{{main|List of earthquakes}}

{{see also|Earthquake}}
An '''earthquake''' is the result of a sudden release of energy in the Earth's geology crust that creates seismic waves. At the Earth's surface, earthquakes manifest themselves by vibration, shaking and sometimes displacement of the ground. The vibrations may vary in magnitude. Earthquakes are caused mostly by slippage within geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and Underground nuclear testingnuclear tests. The underground point of origin of the earthquake is called the ''focus''. The point directly above the focus on the surface is called the ''epicenter''. Earthquakes by themselves rarely kill people or wildlife. It is usually the secondary events that they trigger, such as building collapse, fires, tsunamis, seismic sea waves and volcanoes, that are actually the human disaster. Many of these could possibly be avoided by better construction, safety systems, early warning and evacuation planning.
[[File:1693 Sicily earthquake.jpg|thumb|200px|The [[1693 Sicily earthquake]]. About 60,000 people are thought to have died in this earthquake.]]
An '''earthquake''' is the result of a sudden release of energy in the [[Earth|Earth's]] [[crust (geology)|crust]] that creates [[seismic wave]]s. At the Earth's surface, earthquakes manifest themselves by vibration, shaking and sometimes displacement of the ground. The vibrations may vary in magnitude. Earthquakes are caused mostly by slippage within geological [[Fault (geology)|faults]], but also by other events such as volcanic activity, landslides, mine blasts, and [[Underground nuclear testing|nuclear tests]]. The underground point of origin of the earthquake is called the ''focus''. The point directly above the focus on the surface is called the ''epicenter''. Earthquakes by themselves rarely kill people or wildlife. It is usually the secondary events that they trigger, such as building collapse, fires, [[tsunami]]s (seismic sea waves) and volcanoes, that are actually the human disaster. Many of these could possibly be avoided by better construction, safety systems, early warning and evacuation planning.


Some of the most significant earthquakes in recent times include:
Some of the most significant earthquakes in recent times include:
* The [[2004 Indian Ocean earthquake]], the third largest earthquake in recorded history, registering a [[moment magnitude scale|moment magnitude]] of 9.1-9.3. The huge [[tsunami]]s triggered by this earthquake cost the lives of at least 229,000 people.
* The [[2004 Indian Ocean earthquake]], the third largest earthquake in recorded history, registering a [[moment magnitude scale|moment magnitude]] of 9.1-9.3. The huge [[tsunami]]s triggered by this earthquake cost the lives of at least 229,000 people.
* The [[2011 Tōhoku earthquake and tsunami]] registered a [[moment magnitude scale|moment magnitude]] of 9.0. The death toll from the earthquake and tsunami is over 13,000, and over 12,000 people are still missing.
* The 8.8 magnitude February 27, [[2010 Chile earthquake]] and tsunami cost 525 lives.<ref>^ "USGS Earthquake Details". United States Geological Survey. http://earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2010tfan/. Retrieved February 27, 2010</ref>
* The 7.9 magnitude May 12, [[2008 Sichuan earthquake]] in Sichuan Province, China. Death toll at over 61,150 as of May 27, 2008.
* The 7.7 magnitude [[July 2006 Java earthquake]], which also triggered [[tsunami]]s.
* The 7.6-7.7 magnitude [[2005 Kashmir earthquake]], which cost 79,000 lives in [[Pakistan]].


===Volcanic eruptions===
{{main|List of largest volcanic eruptions}}
{{see also|Types of volcanic eruptions}}
[[File:Deccan Traps volcano.jpg|thumb|Artist's impression of the volcanic eruptions that formed the [[Deccan Traps]] in India.]]
[[Volcanoe]]s can cause widespread destruction and consequent disaster through several ways. The effects include the [[Types of volcanic eruptions|volcanic eruption]] itself that may cause harm following the explosion of the volcano or the fall of rock. Second, [[lava]] may be produced during the eruption of a volcano. As it leaves the volcano, the lava destroys many buildings and plants it encounters. Third, [[volcanic ash]] generally meaning the cooled ash - may form a cloud, and settle thickly in nearby locations. When mixed with water this forms a concrete-like material. In sufficient quantity ash may cause roofs to collapse under its weight but even small quantities will harm humans if inhaled. Since the ash has the consistency of ground glass it causes abrasion damage to moving parts such as engines. The main killer of humans in the immediate surroundings of a volcanic eruption is the [[pyroclastic flows]], which consist of a cloud of hot volcanic ash which builds up in the air above the volcano and rushes down the slopes when the eruption no longer supports the lifting of the gases. It is believed that [[Pompeii]] was destroyed by a pyroclastic flow. A [[lahar]] is a volcanic mudflow or landslide. The 1953 [[Tangiwai disaster]] was caused by a lahar, as was the 1985 [[Armero tragedy]] in which the town of Armero was buried and an estimated 23,000 people were killed.


A specific type of volcano is the [[supervolcano]]. According to the [[Toba catastrophe theory]] 70 to 75 thousand years ago a super volcanic event at [[Lake Toba]] reduced the human population to 10,000 or even 1,000 breeding pairs creating a bottleneck in human evolution.<ref>{{cite news
===Volcanic eruptions
|ref= CITEREFGibbons2010
Volcanoes can cause widespread destruction and consequent disaster through several ways. The effects include the Types of volcanic eruptions itself that may cause harm following the explosion of the volcano or the fall of rock. Second, lava may be produced during the eruption of a volcano. As it leaves the volcano, the lava destroys many buildings and plants it encounters. Third, volcanic ash generally meaning the cooled ash - may form a cloud, and settle thickly in nearby locations. When mixed with water this forms a concrete-like material. In sufficient quantity ash may cause roofs to collapse under its weight but even small quantities will harm humans if inhaled.The main killer of humans in the immediate surroundings of a volcanic eruption is the pyroclastic flows, which consist of a cloud of hot volcanic ash which builds up in the air above the volcano and rushes down the slopes when the eruption no longer supports the lifting of the gases.
|first1= Ann |last1= Gibbons

|title= Human Ancestors Were an Endangered Species
A specific type of volcano is the supervolcano. According to the Toba catastrophe theory 70 to 75 thousand years ago a super volcanic event at Lake Toba reduced the human population to 10,000 or even 1,000 breeding pairs creating a bottleneck in human evolution.
|newspaper= ScienceNow
It also killed three quarters of all plant life in the northern hemisphere. The main danger from a supervolcano is the immense cloud of ash which has a disastrous global effect on climate and temperature for many years.
|date= 19 January 2010
|url= http://sciencenow.sciencemag.org/cgi/content/full/2010/119/2
}}</ref> It also killed three quarters of all plant life in the northern hemisphere. The main danger from a supervolcano is the immense cloud of ash which has a disastrous global effect on climate and temperature for many years.


==Hydrological disasters==
==Hydrological disasters==
===Floods===
===Floods===


A 'flood' is an overflow of an expanse of water that submerges land and also defines a flood as a temporary covering by water of land not normally covered by water In the sense of "flowing water", the word may also be applied to the inflow of the tide.
A '''flood''' is an overflow of an expanse of water that submerges land.<ref>MSN Encarta Dictionary. [http://encarta.msn.com/encnet/features/dictionary/DictionaryResults.aspx?refid=1861612277 Flood.] Retrieved on 2006-12-28. [http://www.webcitation.org/query?id=1257023547055729 Archived] 2009-10-31.</ref> The EU [[Floods directive]] defines a flood as a temporary covering by water of land not normally covered by water.<ref>[http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2007:288:0027:0034:EN:PDF Directive 2007/60/EC Chapter 1 Article2]</ref> In the sense of "flowing water", the word may also be applied to the inflow of the [[tide]].
Flooding may result from the volume of water within a body of water, such as a river or lake, which overflows or breaks levees, with the result that some of the water escapes its usual boundaries.
Flooding may result from the volume of water within a body of water, such as a [[river]] or [[lake]], which overflows or breaks levees, with the result that some of the water escapes its usual boundaries.<ref>Glossary of Meteorology (June 2000). [http://amsglossary.allenpress.com/glossary/search?id=flood1 Flood.] Retrieved on 2009-01-09.</ref>
While the size of a lake or other body of water will vary with seasonal changes in precipitation and snow melt, it is not a significant flood unless such escapes of water endanger land areas used by man like a village, city or other inhabited area. let us take an example the thane storm which attacked tamil nadu.
While the size of a lake or other body of water will vary with seasonal changes in precipitation and snow melt, it is not a significant flood unless such escapes of water endanger land areas used by man like a village, city or other inhabited area. let us take an example the thane storm which attacked tamil nadu.


{{main|List of floods}}

{{see also|Flood}}

[[Image:Limpopo.jpg|thumb|The [[Limpopo River]], in southern [[Mozambique]], during the [[2000 Mozambique flood]]]]
Some of the most notable floods include:
* The [[Huang He]] (Yellow River) in China floods particularly often. The [[1931 Huang He flood|Great Flood of 1931]] caused between 800,000 and 4,000,000 deaths.
* The [[Great Flood of 1993]] was one of the most costly floods in United States history.
* The [[1998 Yangtze River Floods]], in China, left 14 million people homeless.
* The [[2000 Mozambique flood]] covered much of the country for three weeks, resulting in thousands of deaths, and leaving the country devastated for years afterward.
* The [[2005 Mumbai floods]] which destroyed 1094 people.
* The [[2005 Mumbai floods]] which destroyed 1094 people.
* The [[2010 Pakistan floods]], damaged crops and infrastructure, claiming many lives.


[[Tropical cyclone]]s can result in extensive flooding and [[storm surge]], as happened with:

* [[Bhola Cyclone]], which struck [[East Pakistan]] (now [[Bangladesh]]) in 1970,

* [[Typhoon Nina (1975)|Typhoon Nina]], which struck China in 1975,
* [[Hurricane Katrina]], which struck [[New Orleans, Louisiana]] in 2005, and
* [[Cyclone Yasi]], which struck Australia in 2011


===Limnic eruptions===
===Limnic eruptions===
{{see also|Limnic eruption}}

A cow suffocated by gases from Lake Nyos after a limnic eruption A limnic eruption occurs when a gas, usually carbon dioxide, suddenly erupts from deep lake water, posing the threat of suffocating wildlife, livestock and humans. Such an eruption may also cause tsunamis in the lake as the rising gas displaces water. Scientists believe [[landslides]], [[volcanic]] activity, or explosions can trigger such an eruption. To date, only two limnic eruptions have been observed and recorded
[[Image:Cow killed by Lake Nyos gasses.jpg|thumb|left|150px|A cow suffocated by gases from [[Lake Nyos]] after a [[limnic eruption]]]]A [[limnic eruption]] occurs when a gas, usually [[carbon dioxide|CO<sub>2</sub>]], suddenly erupts from deep lake water, posing the threat of suffocating wildlife, livestock and humans. Such an eruption may also cause [[tsunami]]s in the lake as the rising gas displaces water. Scientists believe [[landslides]], [[volcanic]] activity, or explosions can trigger such an eruption. To date, only two limnic eruptions have been observed and recorded:
* In 1984, in Cameroon, a limnic eruption in Lake Monoun caused the deaths of 37 nearby residents.
* In 1984, in [[Cameroon]], a limnic eruption in [[Lake Monoun]] caused the deaths of 37 nearby residents.
* At nearby Lake Nyos in 1986 a much larger eruption killed between 1,700 and 1,800 people by asphyxiation.
* At nearby [[Lake Nyos]] in 1986 a much larger eruption killed between 1,700 and 1,800 people by [[asphyxiation]].


===Tsunamis===
===Tsunamis===
{{main|Historic tsunamis}}
{{see also|Tsunami}}
[[Image:2004-tsunami.jpg|thumb|The [[tsunami]] caused by the December 26, 2004, [[earthquake]] strikes [[Ao Nang]], [[Thailand]].]]


Tsunamis can be caused by undersea earthquakes as the one caused in [[Ao Nang]], Thailand, by the [[2004 Indian Ocean Earthquake]], or by landslides such as the one which occurred at [[Lituya Bay]], [[Alaska]].
The tsunami caused by the December 26, 2004, earthquake strikes Ao Nang, Thailand.
* [[Ao Nang]], Thailand (2004). The [[2004 Indian Ocean Earthquake]] created the [[Boxing Day Tsunami]] and disaster at this site.

* [[Lituya Bay#1958 megatsunami|Lituya Bay]], Alaska (1953).
Tsunamis can be caused by undersea earthquakes as the one caused in Ao Nang, Thailand, by the 2004 Indian Ocean Earthquake, or by landslides such as the one which occurred at Lituya Bay, [Alaska].
* [[2010 Chile earthquake]]

* On October 26, 2010, a tsunami occurred at [[Sumatra]], Indonesia
* On October 26, 2010, a tsunami occurred at [[Sumatra]], Indonesia
* On March 11, 2011, a tsunami occurred near Fukushima, Japan and spread through the Pacific ocean.
* On March 11, 2011, a [[2011 Tōhoku earthquake and tsunami|tsunami occurred near Fukushima, Japan]] and spread through the Pacific.ocean


==Meteorological disasters==
==Meteorological disasters==
{{See also|Meteorological disasters}}

[[File:Young steer after blizzard - NOAA.jpg|thumb|Young steer after a [[blizzard]], March 1966]]



===Blizzards===
===Blizzards===
{{See also|Blizzard}}

Blizzards are severe [[winter storm]]s characterized by low temperature, strong winds, and heavy snow.

Blizzards are severe winter storms characterized by low temperature, strong winds, and heavy snow.
The difference between a blizzard and a snow storm is the strength of the wind.
The difference between a blizzard and a snow storm is the strength of the wind.
To be a considered a blizzard, the storm must have winds in excess of 35 miles per hour, it should reduce the visibility to 1/4 miles, and must last for a prolonged period of 3 hours or more.
To be a considered a blizzard, the storm must have winds in excess of 35 miles per hour, it should reduce the visibility to 1/4 miles, and must last for a prolonged period of 3 hours or more.
Ground blizzards require high winds to stir up snow that has already fallen, rather than fresh snowfall.
[[Ground blizzard]]s require high winds to stir up snow that has already fallen, rather than fresh snowfall.
Blizzards have a negative impact on local economics and can terminate the visibility in regions where snowfall is rare.
Blizzards have a negative impact on local economics and can terminate the visibility in regions where snowfall is rare.


Significant blizzards include:
Significant blizzards include:
*The Great Blizzard of 1888 in the United States
*The [[Great Blizzard of 1888]] in the United States
*The 2008 Afghanistan blizzard
*The [[2008 Afghanistan blizzard]]
*The North American blizzard of 1947
*The [[North American blizzard of 1947]]
*The 1972 Iran blizzard resulted in approximately 4,000 deaths and lasted for 5 to 7 days.
*The [[1972 Iran blizzard]] resulted in approximately 4,000 deaths and lasted for 5 to 7 days.


===Cyclonic storms===
===Cyclonic storms===
{{main|List of tropical cyclones}}

{{see also|Tropical cyclone|Cyclone}}
''Cyclone'', ''tropical cyclone'', ''hurricane'', and ''typhoon'' are different names for the same phenomenon a cyclonic storm system that forms over the oceans. The deadliest hurricane ever was the 1970 Bhola cyclone; the deadliest Atlantic hurricane was the Great Hurricane of 1780 which devastated Martinique, St. Eustatius and Barbados. Another notable hurricane is Hurricane Katrina which devastated the Gulf Coast of the United States in 2005.
''Cyclone'', ''tropical cyclone'', ''hurricane'', and ''typhoon'' are different names for the same phenomenon a cyclonic storm system that forms over the oceans. The deadliest hurricane ever was the 1970 Bhola cyclone; the deadliest Atlantic hurricane was the [[Great Hurricane of 1780]] which devastated Martinique, St. Eustatius and Barbados. Another notable hurricane is [[Hurricane Katrina]] which devastated the Gulf Coast of the United States in 2005.


===Droughts===
===Droughts===
{{see also|Drought}}
[[File:Oxfam East Africa - A family gathers sticks and branches for firewood.jpg|thumb|On the outskirts of [[Dadaab]], Kenya, during the [[2011 East Africa drought]].]]
Drought occurs when rainfall is insufficient to maintain river flow and ground-water levels fall to such an extent that water becomes unavailable or almost unavailable to support life. The formal definition of drought varies from area to area.
Drought occurs when rainfall is insufficient to maintain river flow and ground-water levels fall to such an extent that water becomes unavailable or almost unavailable to support life. The formal definition of drought varies from area to area.


Well-known historical droughts include:
Well-known historical [[drought]]s include:
* 1900 India killing between 250,000 and 3.25 million.
* 1900 India killing between 250,000 and 3.25 million.
* 1921-22 Soviet Union in which over 5 million perished from starvation due to drought
* 1921-22 Soviet Union in which over 5 million perished from starvation due to drought
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===Hailstorms===
===Hailstorms===
{{see also|Hail}}

Hailstorms are rain drops that have formed together into ice. A particularly damaging hailstorm hit Munich, Germany, on July 12, 1984, causing about 2 billion dollars in insurance claims.
Hailstorms are rain drops that have formed together into ice. A particularly damaging hailstorm hit [[Munich]], Germany, on July 12, 1984, causing about 2 billion dollars in [[insurance]] claims.


===Heat waves===
===Heat waves===
{{see also|Heat wave}}
The worst heat wave in recent history was the [[European Heat Wave of 2003]].
[[Image:Hurricane Katrina August 28 2005 NASA.jpg|thumb|[[Hurricane Katrina]]]]


The worst heat wave in recent history was the European Heat Wave of 2003.
A summer heat wave in Victoria, Australia, created conditions which fuelled the massive [[2009 Victorian bushfires|bushfires]] in 2009. [[Melbourne]] experienced three days in a row of temperatures exceeding 40°C with some regional areas sweltering through much higher temperatures. The bushfires, collectively known as "Black Saturday", were partly the act of arsonists.
A summer heat wave in Victoria, Australia, created conditions which fuelled the massive [[2009 Victorian bushfires|bushfires]] in 2009. [[Melbourne]] experienced three days in a row of temperatures exceeding 40°C with some regional areas sweltering through much higher temperatures. The bushfires, collectively known as "Black Saturday", were partly the act of arsonists.


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* [[Ebola hemorrhagic fever]], which has claimed hundreds of victims in Africa in several [[outbreak]]s
* [[Ebola hemorrhagic fever]], which has claimed hundreds of victims in Africa in several [[outbreak]]s


Famines
===Famines===
{{main|List of famines}}
In modern times, famine has hit Sub-Saharan Africa the hardest, although the number of victims of modern famines is much smaller than the number of people killed by the Asian and Droughts and famines in Russia and the Soviet Union|European famines of the 20th century.
{{see also|Famine}}
In modern times, famine has hit [[Sub-Saharan Africa]] the hardest, although the number of victims of modern famines is much smaller than the number of people killed by the Asian and [[Droughts and famines in Russia and the Soviet Union|European]] famines of the 20th century.


==Space disasters==
==Space disasters==
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* [[Survivalism]]
* [[Survivalism]]
* [[World Conference on Disaster Reduction]]
* [[World Conference on Disaster Reduction]]

==References==
{{Reflist}}

==External links==
* {{cite web
| url=http://www.gripweb.org
| title=Global Risk Identification Program (GRIP)
| publisher=GRIP
}}
* {{cite web
| url=http://go.worldbank.org/BCQUXRXOW0
| title=World Bank's Hazard Risk Management
| publisher=World Bank
}}
* {{cite web
| url=http://www.disasternews.net/
| title=Disaster News Network
| accessdate=2006-11-05
}} US news site focused on disaster-related news.
* {{cite web
| url=http://www.em-dat.net
| title=EM-DAT International Disaster Database
| accessdate=2006-11-05
}} Includes country profiles, disaster profiles and a disaster list.
* {{cite web
| url=http://www.whoi.edu/institutes/coi/topicIndex.do?o=read&id=113
| title=Natural Hazard Information from the Coastal Ocean Institute
| publisher=[[Woods Hole Oceanographic Institution]]
| accessdate=2006-11-05
}} Particularly including articles on [[tsunami]]s, [[hurricane]]s and other [[storm]]s.
* {{cite web
| url=http://www.projectarcix.com
| title=ProjectArcix: Global Disaster Information Portal
}} Overviews, consequences, government and citizen responses, and case studies of multiple natural disasters
* {{cite web
| url=http://www.gdacs.org
| title=Global Disaster Alert and Coordination System
| publisher=[[European Commission]] and [[United Nations]] website initiative
}}
* {{cite web
| url=http://www.undp.org/bcpr/
| title=What the Development Programme of the United Nations (UN) does to reduce the human risks linked to Natural Disasters
| publisher=United Nations Development Programme (UNDP)
}}
* {{cite web
| url=http://gridca.grid.unep.ch/undp/
| title=Pioneering Disaster Risk Index (DRI) Tool
| publisher=United Nations Development Programme (UNDP)
}} Provides key information on all countries in the world.
* {{cite web
| url=http://across.co.nz/WorldsWorstDisasters.html
| title=World's Worst Natural Disasters
| accessdate=2009-07-01
}} Includes list of world's deadliest disasters in history.
* {{cite web
| url=http://site.ebrary.com/lib/disaster/home.action
| title= Natural Disaster and Extreme Weather. Searchable Information Center
| publisher= [[Ebrary]]
}}

{{Disasters}}

{{DEFAULTSORT:Natural Disaster}}
[[Category:Natural disasters| ]]

[[af:Natuurramp]]
[[ar:كارثة طبيعية]]
[[an:Desastre natural]]
[[be:Стыхійнае бедства]]
[[be-x-old:Стыхійнае бедзтва]]
[[bg:Природно бедствие]]
[[bs:Prirodna katastrofa]]
[[ca:Catàstrofe natural]]
[[cy:Trychineb naturiol]]
[[da:Naturkatastrofe]]
[[de:Naturkatastrophe]]
[[et:Loodusõnnetus]]
[[el:Φυσική καταστροφή]]
[[es:Desastre natural]]
[[eo:Naturkatastrofo]]
[[eu:Hondamen natural]]
[[fa:بلایای طبیعی]]
[[fo:Náttúruvanlukka]]
[[fr:Catastrophe#Catastrophes naturelles]]
[[gl:Catástrofes naturais]]
[[gu:કુદરતી આફતો]]
[[ko:자연재해]]
[[hi:प्राकृतिक आपदा]]
[[hr:Prirodna katastrofa]]
[[id:Bencana alam]]
[[is:Náttúruhamfarir]]
[[it:Disastro naturale]]
[[he:אסון טבע]]
[[kn:ನೈಸರ್ಗಿಕ ವಿಕೋಪ]]
[[kk:Тілсіз қияпат]]
[[la:Calamitas naturalis]]
[[lv:Dabas katastrofas]]
[[lt:Stichinė nelaimė]]
[[hu:Természeti katasztrófa]]
[[ml:പ്രകൃതിക്ഷോഭം]]
[[ms:Bencana alam]]
[[mn:Байгалийн гамшиг]]
[[nl:Natuurramp]]
[[ja:自然災害]]
[[no:Naturkatastrofe]]
[[nn:Naturkatastrofe]]
[[oc:Catastròfa naturala]]
[[pnb:قدرتی تباہی]]
[[km:គ្រោះមហន្តរាយ]]
[[pl:Klęska żywiołowa]]
[[pt:Desastre natural]]
[[ro:Catastrofă naturală]]
[[ru:Стихийное бедствие]]
[[scn:Disastru]]
[[simple:Natural disaster]]
[[sl:Naravna katastrofa]]
[[sr:Природне катастрофе]]
[[sh:Prirodna katastrofa]]
[[fi:Uhka]]
[[sv:Naturkatastrof]]
[[ta:இயற்கைப் பேரழிவு]]
[[te:ప్రకృతి వైపరీత్యాలు]]
[[th:ภัยธรรมชาติ]]
[[tg:Офатҳои табиӣ]]
[[tr:Doğal afet]]
[[uk:Стихійне лихо]]
[[ur:قدرتی آفت]]
[[vi:Thiên tai]]
[[war:Calamidad]]
[[zh:天灾]]

Revision as of 15:00, 26 January 2012

Not to be confused with environmental disaster.

A natural disaster is the effect of a natural hazard (e.g., flood, tornado, hurricane, volcanic eruption, earthquake, heatwave, or landslide). It leads to financial, environmental or human losses. The resulting loss depends on the vulnerability of the affected population to resist the hazard, also called their resilience. if these disasters continues it would be a great danger for the earth.[1] This understanding is concentrated in the formulation: "disasters occur when hazards meet vulnerability."[2] Thus a natural hazard will not result in a natural disaster in areas without vulnerability, e.g. strong earthquakes in uninhabited areas.[3] The term natural has consequently been disputed because the events simply are not hazards or disasters without human involvement.[4] A concrete example of the division between a natural hazard and a natural disaster is that the 1906 San Francisco earthquake was a disaster, whereas earthquakes are a hazard. This article gives an introduction to notable natural disasters, refer to the list of natural disasters for a comprehensive listing.

Main articles: Disaster and List of natural disasters

Geological disasters

Avalanches

Main article: List of avalanches
See also: Avalanche
A powder snow avalanche

During World War I, an estimated 40,000 to 80,000 soldiers died as a result of avalanches during the mountain campaign in the Alps at the Austrian-Italian front, many of which were caused by artillery fire.[5]

Earthquakes

Main article: List of earthquakes
See also: Earthquake
The 1693 Sicily earthquake. About 60,000 people are thought to have died in this earthquake.

An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. At the Earth's surface, earthquakes manifest themselves by vibration, shaking and sometimes displacement of the ground. The vibrations may vary in magnitude. Earthquakes are caused mostly by slippage within geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. The underground point of origin of the earthquake is called the focus. The point directly above the focus on the surface is called the epicenter. Earthquakes by themselves rarely kill people or wildlife. It is usually the secondary events that they trigger, such as building collapse, fires, tsunamis (seismic sea waves) and volcanoes, that are actually the human disaster. Many of these could possibly be avoided by better construction, safety systems, early warning and evacuation planning.

Some of the most significant earthquakes in recent times include:

Volcanic eruptions

Main article: List of largest volcanic eruptions
See also: Types of volcanic eruptions
Artist's impression of the volcanic eruptions that formed the Deccan Traps in India.

Volcanoes can cause widespread destruction and consequent disaster through several ways. The effects include the volcanic eruption itself that may cause harm following the explosion of the volcano or the fall of rock. Second, lava may be produced during the eruption of a volcano. As it leaves the volcano, the lava destroys many buildings and plants it encounters. Third, volcanic ash generally meaning the cooled ash - may form a cloud, and settle thickly in nearby locations. When mixed with water this forms a concrete-like material. In sufficient quantity ash may cause roofs to collapse under its weight but even small quantities will harm humans if inhaled. Since the ash has the consistency of ground glass it causes abrasion damage to moving parts such as engines. The main killer of humans in the immediate surroundings of a volcanic eruption is the pyroclastic flows, which consist of a cloud of hot volcanic ash which builds up in the air above the volcano and rushes down the slopes when the eruption no longer supports the lifting of the gases. It is believed that Pompeii was destroyed by a pyroclastic flow. A lahar is a volcanic mudflow or landslide. The 1953 Tangiwai disaster was caused by a lahar, as was the 1985 Armero tragedy in which the town of Armero was buried and an estimated 23,000 people were killed.

A specific type of volcano is the supervolcano. According to the Toba catastrophe theory 70 to 75 thousand years ago a super volcanic event at Lake Toba reduced the human population to 10,000 or even 1,000 breeding pairs creating a bottleneck in human evolution.[7] It also killed three quarters of all plant life in the northern hemisphere. The main danger from a supervolcano is the immense cloud of ash which has a disastrous global effect on climate and temperature for many years.

Hydrological disasters

Floods

A flood is an overflow of an expanse of water that submerges land.[8] The EU Floods directive defines a flood as a temporary covering by water of land not normally covered by water.[9] In the sense of "flowing water", the word may also be applied to the inflow of the tide. Flooding may result from the volume of water within a body of water, such as a river or lake, which overflows or breaks levees, with the result that some of the water escapes its usual boundaries.[10] While the size of a lake or other body of water will vary with seasonal changes in precipitation and snow melt, it is not a significant flood unless such escapes of water endanger land areas used by man like a village, city or other inhabited area. let us take an example the thane storm which attacked tamil nadu.

Main article: List of floods
See also: Flood
The Limpopo River, in southern Mozambique, during the 2000 Mozambique flood

Some of the most notable floods include:

Tropical cyclones can result in extensive flooding and storm surge, as happened with:

Limnic eruptions

See also: Limnic eruption
A cow suffocated by gases from Lake Nyos after a limnic eruption

A limnic eruption occurs when a gas, usually CO2, suddenly erupts from deep lake water, posing the threat of suffocating wildlife, livestock and humans. Such an eruption may also cause tsunamis in the lake as the rising gas displaces water. Scientists believe landslides, volcanic activity, or explosions can trigger such an eruption. To date, only two limnic eruptions have been observed and recorded:

  • In 1984, in Cameroon, a limnic eruption in Lake Monoun caused the deaths of 37 nearby residents.
  • At nearby Lake Nyos in 1986 a much larger eruption killed between 1,700 and 1,800 people by asphyxiation.

Tsunamis

Main article: Historic tsunamis
See also: Tsunami
The tsunami caused by the December 26, 2004, earthquake strikes Ao Nang, Thailand.

Tsunamis can be caused by undersea earthquakes as the one caused in Ao Nang, Thailand, by the 2004 Indian Ocean Earthquake, or by landslides such as the one which occurred at Lituya Bay, Alaska.

Meteorological disasters

See also: Meteorological disasters
Young steer after a blizzard, March 1966

Blizzards

See also: Blizzard

Blizzards are severe winter storms characterized by low temperature, strong winds, and heavy snow. The difference between a blizzard and a snow storm is the strength of the wind. To be a considered a blizzard, the storm must have winds in excess of 35 miles per hour, it should reduce the visibility to 1/4 miles, and must last for a prolonged period of 3 hours or more. Ground blizzards require high winds to stir up snow that has already fallen, rather than fresh snowfall. Blizzards have a negative impact on local economics and can terminate the visibility in regions where snowfall is rare.

Significant blizzards include:

Cyclonic storms

Main article: List of tropical cyclones
See also: Tropical cyclone and Cyclone

Cyclone, tropical cyclone, hurricane, and typhoon are different names for the same phenomenon a cyclonic storm system that forms over the oceans. The deadliest hurricane ever was the 1970 Bhola cyclone; the deadliest Atlantic hurricane was the Great Hurricane of 1780 which devastated Martinique, St. Eustatius and Barbados. Another notable hurricane is Hurricane Katrina which devastated the Gulf Coast of the United States in 2005.

Droughts

See also: Drought
On the outskirts of Dadaab, Kenya, during the 2011 East Africa drought.

Drought occurs when rainfall is insufficient to maintain river flow and ground-water levels fall to such an extent that water becomes unavailable or almost unavailable to support life. The formal definition of drought varies from area to area.

Well-known historical droughts include:

  • 1900 India killing between 250,000 and 3.25 million.
  • 1921-22 Soviet Union in which over 5 million perished from starvation due to drought
  • 1928-30 northwest China resulting in over 3 million deaths by famine.
  • 1936 and 1941 Sichuan Province China resulting in 5 million and 2.5 million deaths respectively.
  • As of 2006, states of Australia including South Australia, Western Australia, New South Wales, Northern Territory and Queensland had been under drought conditions for five to ten years. The drought is beginning to affect urban area populations for the first time. With the majority of the country under water restrictions.
  • In 2006, Sichuan Province China experienced its worst drought in modern times with nearly 8 million people and over 7 million cattle facing water shortages.
  • 12-year drought that was devastating southwest Western Australia, southeast South Australia, Victoria and northern Tasmania was "very severe and without historical precedent".

Hailstorms

See also: Hail

Hailstorms are rain drops that have formed together into ice. A particularly damaging hailstorm hit Munich, Germany, on July 12, 1984, causing about 2 billion dollars in insurance claims.

Heat waves

See also: Heat wave

The worst heat wave in recent history was the European Heat Wave of 2003.

Hurricane Katrina

A summer heat wave in Victoria, Australia, created conditions which fuelled the massive bushfires in 2009. Melbourne experienced three days in a row of temperatures exceeding 40°C with some regional areas sweltering through much higher temperatures. The bushfires, collectively known as "Black Saturday", were partly the act of arsonists.

The 2010 Northern Hemisphere summer resulted in severe heat waves, which killed over 2,000 people. It resulted in hundreds of wildfires which causing widespread air pollution, and burned thousands of square miles of forest.

Tornadoes

Main article: List of tornadoes and tornado outbreaks
See also: Tornado

A tornado is a violent, dangerous, rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to as a twister or a cyclone,[11] although the word cyclone is used in meteorology in a wider sense, to name any closed low pressure circulation. Tornadoes come in many shapes and sizes, but are typically in the form of a visible condensation funnel, whose narrow end touches the earth and is often encircled by a cloud of debris and dust. Most tornadoes have wind speeds less than 110 miles per hour (177 km/h), are approximately 250 feet (80 m) across, and travel a few miles (several kilometers) before dissipating. The most extreme tornadoes can attain wind speeds of more than 300 mph (480 km/h), stretch more than two miles (3 km) across, and stay on the ground for dozens of miles (more than 100 km).[12][13][14]

Well-known historical tornadoes include:

Fires

Main article: List of forest fires
See also: Wildfire

Wildfires are an uncontrolled fire burning in wildland areas. Common causes include lightning and drought but wildfires may also be started by human negligence or arson. They can be a threat to those in rural areas and also wildlife.

Notable cases of wildfires were the 1871 Peshtigo Fire in the United States, which killed at least 1700 people, and the 2009 Victorian bushfires in Australia.

Health disasters

Epidemics

Main article: List of epidemics
See also: Epidemics
The A H5N1 virus, which causes Avian influenza

An epidemic is an outbreak of a contractible disease that spreads at a rapid rate through a human population. A pandemic is an epidemic whose spread is global. There have been many epidemics throughout history, such as Black Death. In the last hundred years, significant pandemics include:

  • The 1918 Spanish flu pandemic, killing an estimated 50 million people worldwide
  • The 1957-58 Asian flu pandemic, which killed an estimated 1 million people
  • The 1968-69 Hong Kong flu pandemic
  • The 2002-3 SARS pandemic
  • The AIDS pandemic, beginning in 1959
  • The H1N1 Influenza (Swine Flu) Pandemic 2009-2010

Other diseases that spread more slowly, but are still considered to be global health emergencies by the WHO include:

Famines

Main article: List of famines
See also: Famine

In modern times, famine has hit Sub-Saharan Africa the hardest, although the number of victims of modern famines is much smaller than the number of people killed by the Asian and European famines of the 20th century.

Space disasters

File:Tunguska event fallen trees.jpg
Fallen trees caused by the Tunguska meteoroid of the Tunguska event in June 1908.

Impact events

See also: impact event

One of the largest impact events in modern times was the Tunguska event in June 1908.

Solar flares

See also: solar flare

A solar flare is a phenomenon where the sun suddenly releases a great amount of solar radiation, much more than normal. Some known solar flares include:

Gamma ray burst

Gamma ray bursts are the most powerful explosions that occur in the universe. They release an enormous amount of energy in milliseconds or longing for ten seconds. They release the same energy that the Sun would have given in its whole life or even more than that. Gamma ray bursts are not rare events because they occur about once every day and are detected by telescopes both on Earth and in space. Mostly large masses of stars, bigger than the Sun, can produce a GRB. A GRB of distances nearer than 8000 light years may cause a concern to life on Earth. Mainly Wolf-Rayet stars WR 104 can produce GRB. Astronomers do believe that the Ordovician–Silurian extinction, the second most destructive extinction on Earth, might have been due to a GRB.

Protection by international law

International law, for example Geneva Conventions defines International Red Cross and Red Crescent Movement the Convention on the Rights of Persons with Disabilities, requires that "States shall take, in accordance with their obligations under international law, including international humanitarian law and international human rights law, all necessary measures to ensure the protection and safety of persons with disabilities in situations of risk, including the occurrence of natural disaster."[18] And further United Nations Office for the Coordination of Humanitarian Affairs is formed by General Assembly Resolution 44/182.

See also

References

  1. ^ G. Bankoff, G. Frerks, D. Hilhorst (eds.) (2003). Mapping Vulnerability: Disasters, Development and People. ISBN ISBN 1-85383-964-7. {{cite book}}: Check |isbn= value: invalid character (help)CS1 maint: multiple names: authors list (link)
  2. ^ B. Wisner, P. Blaikie, T. Cannon, and I. Davis (2004). At Risk - Natural hazards, people's vulnerability and disasters. Wiltshire: Routledge. ISBN ISBN 0-415-25216-4. {{cite book}}: Check |isbn= value: invalid character (help)CS1 maint: multiple names: authors list (link)
  3. ^ Luis Flores Ballesteros. "What determines a disaster?" 54 Pesos Sep 2008:54 Pesos 11 Sep 2008. <http://54pesos.org/2008/09/11/what-determines-a-disaster/>
  4. ^ D. Alexander (2002). Principles of Emergency planning and Management. Harpended: Terra publishing. ISBN ISBN 1-903544-10-6. {{cite book}}: Check |isbn= value: invalid character (help)
  5. ^ Lee Davis (2008). "Natural Disasters". Infobase Publishing. p.7. ISBN 0816070008
  6. ^ ^ "USGS Earthquake Details". United States Geological Survey. http://earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2010tfan/. Retrieved February 27, 2010
  7. ^ Gibbons, Ann (19 January 2010). "Human Ancestors Were an Endangered Species". ScienceNow.{{cite news}}: CS1 maint: ref duplicates default (link)
  8. ^ MSN Encarta Dictionary. Flood. Retrieved on 2006-12-28. Archived 2009-10-31.
  9. ^ Directive 2007/60/EC Chapter 1 Article2
  10. ^ Glossary of Meteorology (June 2000). Flood. Retrieved on 2009-01-09.
  11. ^ merriam-webster.com
  12. ^ Wurman, Joshua (2008-08-29). "Doppler On Wheels". Center for Severe Weather Research. Retrieved 2009-12-13.
  13. ^ "Hallam Nebraska Tornado". National Weather Service. National Oceanic and Atmospheric Administration. 2005-10-02. Retrieved 2009-11-15.
  14. ^ Roger Edwards (2006-04-04). "The Online Tornado FAQ". National Weather Service. National Oceanic and Atmospheric Administration. Retrieved 2006-09-08.
  15. ^ a b "Sun Unleashes Record Superflare, Earth Dodges Solar Bullet". ScienceDaily. April 4, 2011. Retrieved 2011-08-27.
  16. ^ "Biggest Solar Flare ever recorded". National Association for Scientific and Cultural Appreciation. 2004. Retrieved 2011-08-27.
  17. ^ "A Super Solar Flare". NASA. May 6, 2008. Retrieved 2011-08-27.
  18. ^ Article 11 of the Convention on the Rights of Persons with Disabilities
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