An earthquake 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. At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacing the ground. This book studies various types of naturally occurring earthquakes including elastic energy, asperity, focal mechanism, subduction, and sonic boom.
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