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[[File:Japan quake sendai.jpg|thumb|200px|Japan quake 2011.]]
An '''earthquake''' is when the [[Earth]] shakes, caused by [[plate tectonics|tectonic]] activity in an area after the release of stored [[energy]] from the [[rock]]. Earthquakes most commonly occur on tectonic plate boundaries, and also occur along [[fault|faults]] where previous movement has occurred. There are 500,000 detectable earthquakes in the world each year.
An '''earthquake''' is when the [[Earth]] shakes, caused by [[plate tectonics|tectonic]] activity in an area after the release of stored [[energy]] from the [[rock]]. Earthquakes most commonly occur on tectonic plate boundaries, and also occur along [[fault|faults]] where previous movement has occurred. There are 500,000 detectable earthquakes in the world each year.
The severity of earthquakes is measured using the [[Richter scale]].
The severity of earthquakes is measured using the [[Richter scale]].
{{Clear}}
==Also See==
==See also==
* [[seismic]]
* [[seismic]]
* [[Loma Prieta Earthquake]]
* [[Loma Prieta Earthquake]]