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Earthquakes are common on the West Coast, with multiple plate boundaries like the San Andreas fault making geologic activity more likely. They are rarer on the East Coast, but they do happen ...
The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. In its most general sense, the word earthquake is used to describe any seismic event that generates seismic waves. Earthquakes can occur naturally or be induced by human activities, such as mining, fracking, and nuclear tests.
2010 Chile earthquake and tsunami – magnitude 8.8 earthquake, ~525 fatalities and unknown number of injuries, none in the United States 2011 Tohoku earthquake and tsunami – magnitude 9.0 earthquake, 15,850–28,000 fatalities and 6,011 injured, one fatality and unknown number of injuries in the United States
Earthquakes are common along convergent boundaries. A region of high earthquake activity, the Wadati–Benioff zone, generally dips 45° and marks the subducting plate. Earthquakes will occur to a depth of 670 km (416 mi) along the Wadati-Benioff margin. [citation needed] Both compressional and extensional forces act along convergent boundaries.
According to Volcano Discovery, Kentucky commonly sees earthquakes. Since March 5, 11 earthquakes have occurred in the commonwealth, with ten below a 2.0 magnitude.
East Coast residents were jolted Friday by a 4.8-magnitude earthquake centered near Lebanon, New Jersey, with weak rumblings felt as far away as Baltimore and the Massachusetts-New Hampshire border.
Earthquake epicenters 1963–98. In seismology, a seismic zone or seismic belt is an area of seismicity potentially sharing a common cause. It can be referred to as an earthquake belt as well. It may also be a region on a map for which a common areal rate of seismicity is assumed for the purpose of calculating probabilistic ground motions.
The primary purpose of a seismometer is to locate the initiating points of earthquake epicenters. The secondary purpose, of determining the 'size' or magnitude must be calculated after the precise location is known. [citation needed] The earliest seismographs were designed to give a sense of the direction of the first motions from an earthquake.