Epicenter: In the seismology branch of geology, an epicenter of an earthquake is the point on Earth’s surface that is directly above the focus (or hypocenter). It is the ground surface location overlying where an earthquake rupture originates within a dip-slip fault or strike-slip fault.

Shortly after an earthquake, United States Geological Survey (USGS) geologists apply data from at least three global positioning data devices and seismographs, in order to locate the epicenter, as well as the focus, or hypocenter.

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