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What Causes Earth Quakes

What Causes Earth Quake

An earthquake is the result of a sudden release of energy in the Earth's Crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time.

Earthquakes are measured using observations from seismometers. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe. The more numerous earthquakes smaller than magnitude 5 reported by national seismological observatories are measured mostly on the local magnitude scale, also referred to as the Richter scale. These two scales are numerically similar over their range of validity.

Categories : Geography Graphs | Published by : dailygraphs | Date : Nov 16, 2013
Tags: causes of earth quakes, earth quakes, reasons for earth quakes

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Source : http://en.ria.ru/
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