Earthquake
Earthquakes occur when there is friction between two of the major or minor tectonic plates of the Earth’s crust. This friction is often caused by the tectonic plates rising above or sliding underneath each other, and can result in massive amounts of damage and also fatalities.
In its most general sense, the word earthquake is used to describe any seismic event — whether natural or caused by humans — that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake’s point of initial rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter.
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