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Thursday, March 17, 2011

Japan Earthquakes

An earthquake (also known as a quake, tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismicity or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. Earthquakes are measured with a seismometer (also called a seismograph).  Can you imagine 513 earthquakes occurred as of this writing in Japan?

Below is a screen shot  from USGS-Earthquake Monitoring:

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