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Earthquake

   

            An earthquake is a sudden release of energy in the earth’s crust that creates seismic waves. The seismicity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. In its most general sense, the word earthquake is used to describe any seismic event that generates seismic waves. Earthquakes are caused monthly 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. 

Aerial photo of the San Andreas Fault in the Carrizo Plain,

 northwest of Los Angeles

http://en.wikipedia.org/wiki/Earthquake

 Discussion:

- Do you know how to survive during an earthquaque?

This video is about some of the safety tips if you feel the shake of an earthquake.