Natural Disaster

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Index
Introduction ……………………………………………………………....3 Earth quakes ……………………………………………..……………….3 Volcanic eruptions………………………………………………………...3 Floods………………………………………………………………..…….4 Limnic eruptions…………………………………………………………4 Tsunamis……………………………………………………………….…5 Blizzards …………………………………………………………………5 Droughts &Hailstorms ……………………………………………........6 Tornadoes & Fires …………………………………………….………..7 Gamma ray burst ……………………………………….………………7 Conclusion ………………………………………………………………7 References …………………………………………………………………………..…………….8

Natural disasters
introduction
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. This understanding is concentrated in the formulation: "disasters occur when hazards meet vulnerability." A natural hazard will hence never result in a natural disaster in areas without vulnerability, e.g. strong earthquakes in uninhabited areas. The term natural has consequently been disputed because the events simply are not hazards or disasters without human involvement. 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. Geological disasters

Earthquakes
An earthquake is a sudden shake of the Earth's crust caused by the tectonic plates colliding. The vibrations may vary in magnitude. 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.Earthquakes are caused by the discharge of energy accumulated along geologic fault. 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 of 9.1-9.3. The huge tsunamis triggered by this earthquake cost the lives of at least 229,000 people. * The 2011 Tōhoku earthquake and tsunami registered a 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. * 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 tsunamis. * The 7.6-7.7 2005 Kashmir earthquake, which cost 79,000 lives in Pakistan. Volcanic eruptions (S.C.S)

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...
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