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| Natural hazard ： ウィキペディア英語版 |
Natural hazard
A natural hazard is a naturally occurring event that might have a negative effect on people or the environment. Natural hazard events can be grouped into two broad categories. Geophysical hazards〔(Geography in the News - topical geography resources for teachers and students )〕 encompass geological and meteorological phenomena such as earthquakes, coastal erosion, volcanic eruption, cyclonic storms, and drought. Biological hazards can refer to a diverse array of disease and infestation. Other natural hazards such as floods and wildfires can result from a combination of geological, hydrological, and climatic factors.
Many geophysical hazards are interrelated;〔http://onlinelibrary.wiley.com/doi/10.1002/2013RG000445/abstract〕 for example, submarine earthquakes can cause tsunamis, and hurricanes can lead to coastal flooding and erosion. It is possible that some natural hazards are intertemporally correlated as well.〔http://onlinelibrary.wiley.com/doi/10.1002/2013RG000445/abstract〕〔http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1679224〕 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 living on a fault line is a hazard.
==Geological hazards==
(詳細はウィキペディア（Wikipedia）』
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