Major Natural Disaster - Top List natural disaster

A natural disaster is a major adverse event resulting from natural processes of the Earth; examples are floods, hurricanes, tornadoes, volcanic eruptions, earthquakes, tsunamis, storms, and other geologic processes. A natural disaster can cause loss of life or damage property, and typically leaves some economic damage in its wake, the severity of which depends on the affected population's resilience (ability to recover) and also on the infrastructure available.

An adverse event will not rise to the level of a disaster if it occurs in an area without vulnerable population. In a vulnerable area, however, such 

as Nepal during the 2015 earthquake, an earthquake can have disastrous consequences and leave lasting damage, which can require years to repair.

1 Geological disasters

1.1 Avalanches and landslides

1.2 Earthquakes

1.3 Sinkholes

1.4 Volcanic eruptions

2 Hydrological disasters

2.1 Floods

2.2 Tsunami

2.3 Limnic eruptions

3 Meteorological disasters

3.1 Cyclonic storms

3.2 Blizzards

3.3 Hailstorms

3.4 Ice storms

3.5 Cold waves

3.6 Heat waves

3.7 Droughts

3.8 Thunderstorms

3.9 Tornadoes

4 Wildfires

5 Space disasters

5.1 Impact events and airburst

5.2 Solar flare

Geological disasters

Avalanches and landslides

A landslide in San Clemente, California in 1966

A landslide is described as an outward and downward slope movement of an abundance of slope-forming materials including rock, soil, artificial, or even a combination of these things.

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 the avalanches were caused by artillery fire.

Earthquakes

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. Earthquakes are caused by slippage within geological 

faults. The underground point of origin of the earthquake is called the seismic 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. Many of these could possibly be avoided by better construction, safety systems, early warning and planning.

Sinkholes

The Red Lake in Croatia

When natural erosion, human mining or underground excavation makes the ground too weak to support the structures built on it, the ground can collapse and produce a sinkhole. For example, the 2010 Guatemala City sinkhole, which killed fifteen people, was caused when heavy rain from Tropical Storm Agatha, diverted by leaking pipes into a pumice bedrock, led to the sudden collapse of the ground beneath a factory building.

Volcanic eruptions

Volcanoes can cause widespread destruction and consequent disaster in several ways. The effects include the volcanic eruption itself that may 

cause harm following the explosion of the volcano or falling rocks. Secondly, lava may be produced during the eruption of a volcano, and so 

as it leaves the volcano the lava destroys many buildings, plants and animals due to its extreme heat. Thirdly, 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 

quantities, 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.

Volcanoes rated at 8 (the highest level) on the Volcanic Explosivity Index are known as supervolcanoes. According to the Toba catastrophe theory, 

75,000 to 80,000 years ago a supervolcanic eruption at what is now Lake 

Toba in Sumatra reduced the human population to 10,000 or even 1,000 

breeding pairs, creating a bottleneck in human evolution, and killed three-quarters of all plant life in the northern hemisphere. However, there 

is considerable debate regarding the veracity of this theory. 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

The Limpopo River during the 2000 Mozambique flood

A violent, sudden and destructive change either in the quality of Earth's water or in the distribution or movement of water on land below the surface or in the atmosphere.

Floods

A flood is an overflow of water that 'submerges' land.[9] The EU Floods Directive defines a flood as a temporary covering the land with water 

which is usually not covered by water. In the sense of 'flowing water', the word may also be applied to the inflow of the tides. Flooding may result 

from the volume of water within a body of water, such as a river or lake, which overflows, causing some of the water to escape its usual boundaries. 

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 the water covers land used by man, like a village, city or other inhabited area, roads, expanses of farmland, etc.

Tsunami

A tsunami (plural: tsunamis or tsunami; from Japanese: 津波, lit. "harbour wave"; English pronunciation: /tsuːˈnɑːmi/), also known as a 

seismic sea wave or as a tidal wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an 

ocean or a large lake. Tsunamis can be caused by undersea earthquakes such as the 2004 Boxing Day tsunami, or by landslides such as the one in 

1958 at Lituya Bay, Alaska, or by volcanic eruptions such as the ancient eruption of Santorini. On March 11, 2011, a tsunami occurred near 

Fukushima, Japan and spread through the Pacific Ocean.

Limnic eruptions

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, and at nearby Lake Nyos in 1986 a much larger eruption killed between 1,700 and 1,800 people by asphyxiation.

Meteorological disasters

Young steer after a blizzard, March 1966

Main article: Meteorological disasters

Cyclonic storms

Cyclone, tropical cyclone, hurricane, and typhoon are different names for the same phenomenon, which is a cyclonic storm system that forms over 

the oceans. The determining factor on which term is used is based on where they originate. In the Atlantic and Northeast Pacific, the term 

"hurricane" is used; in the Northwest Pacific it is referred to as a "typhoon" and "cyclones" occur in the South Pacific and Indian Ocean.

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.

Blizzards

Blizzards are severe winter storms characterized by heavy snow and strong winds. When high winds stir up snow that has already fallen, it is 

known as a ground blizzard. Blizzards can impact local economic activities, especially in regions where snowfall is rare. The Great Blizzard of 1888 affected the United States, when many tons of wheat crops were destroyed, and in Asia, 2008 Afghanistan blizzard and the 1972 Iran blizzard were also significant events. The 1993 Superstorm originated in the Gulf of Mexico and traveled north, causing damage in 26 states as well as Canada and leading to more than 300 deaths.

Hailstorms

Hailstorms are precipitation in the form of ice, with the ice not melting before it hits the ground. Hailstones usually measure between 0.2-inch (5 

millimetres) and 6 inches (15 centimetres) in diameter. A particularly damaging hailstorm hit Munich, Germany, on July 12, 1984, causing 

about $2 billion in insurance claims.

Ice storms

An ice storm is a type of winter storm characterized by freezing rain. The U.S. National Weather Service defines an ice storm as a storm which 

results in the accumulation of at least 0.25-inch (6.4 mm) of ice on exposed surfaces.

Cold waves

A cold wave (known in some regions as a cold snap or cold spell) is a weather phenomenon that is distinguished by a cooling of the air. 

Specifically, as used by the U.S. National Weather Service, a cold wave is a rapid fall in temperature within a 24-hour period requiring 

substantially increased protection to agriculture, industry, commerce, and social activities. The precise criterion for a cold wave is determined by the 

      rate at which the temperature falls, and the minimum to which it falls. This minimum temperature is dependent on the geographical region and time of year.

                       

Heat waves

A heat wave is a period of unusually and excessively hot weather. 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 bushfires in 2009. Melbourne experienced three days in a row of temperatures exceeding 40 °C (104 °F) 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 

caused widespread air pollution, and burned thousands of square miles of forest.

A classic anvil-shaped, and clearly-developed Cumulonimbus incus

Droughts

Drought is the unusual dryness of soil caused by levels of rainfall significantly below average over a prolonged period. Hot dry winds, 

shortage of water, high temperatures and consequent evaporation of moisture from the ground can also contribute to conditions of drought. Droughts result in crop failure and shortages of water.

Well-known historical droughts include the 1997–2009 Millennium Drought in Australia led to a water supply crisis across much of the 

country. As a result, many desalination plants were built for the first time (see list). In 2011, the State of Texas lived under a drought emergency 

declaration for the entire calendar year and severe economic losses. The drought caused the Bastrop fires.

Thunderstorms

Severe storms, dust clouds, and volcanic eruptions can generate lightning. 

Apart from the damage typically associated with storms, such as winds, 

hail, and flooding, the lightning itself can damage buildings, ignite fires 

and kill by direct contact. Especially deadly lightning incidents include a 2007 strike in Ushari Dara, a remote mountain village in northwestern Pakistan, that killed 30 people,[14] the crash of LANSA Flight 508 which 

killed 91 people, and a fuel explosion in Dronka, Egypt caused by lightning in 1994 which killed 469. Most lightning deaths occur in the poor countries of America and Asia, where lightning is common and adobe mud brick housing provides little protection.

A large hailstone, about 6 cm (2.4 in) in diameter

Tornadoes

A tornado is a violent and dangerous rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud, or 

the base of a cumulus cloud in rare cases. It is also referred to as a twister or a cyclone, although the word cyclone is used in meteorology in a wider 

sense, to refer to 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 (perhaps more than 100 km).

Wildfires

Wildfires are large fires which often start in wildland areas. Common causes include lightning and drought but wildfires may also be started by 

human negligence or arson. They can spread to populated areas and can thus be a threat to humans and property, as well as 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.

Space disasters

Fallen trees caused by the Tunguska meteoroid of the Tunguska event in June 1908.

Impact events and airburst

Asteroids that impact the Earth have led to several major extinction events, including one which created the Chicxulub crater 64.9 million years ago and which is associated with the demise of the dinosaurs. Scientists estimate that the likelihood of death for a living human from a global impact event is comparable to the probability of death from an airliner crash.

No human death has been definitively attributed to an impact event, but the 1490 Ch'ing-yang event in which over 10,000 people may have died 

has been linked to a meteor shower. Even asteroids and comets that burn up in the atmosphere can cause significant destruction on the ground due 

to the air burst explosion: notable air bursts include the Tunguska event in June 1908, which devastated large areas of Siberian countryside, and 

the Chelyabinsk meteor on 15 February 2013, which caused widespread property damage in the city of Chelyabinsk and injured 1,491.

Solar flare

A solar flare is a phenomenon where the Sun suddenly releases a great amount of solar radiation, much more than normal. Solar flares are unlikely to cause any direct injury, but can destroy electrical equipment. The potential of solar storms to cause disaster was seen during the 1859 Carrington event, which disrupted the telegraph network, and the March 1989 geomagnetic storm which blacked out Quebec. Some major known solar flares include the X20 event on August 16, 1989, and a similar flare on April 2, 2001. The most powerful flare ever recorded occurred on November 4, 2003 (estimated at between X40 and X45).