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What is the "epicenter" and "hypocenter" of an earthquake?

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What is the "epicenter" and "hypocenter" of an earthquake?

The epicenter of an earthquake is the point on the surface of the ground directly above where the earthquake begins. The hypocenter of an earthquake is the point below the earth's surface where the rupture begins. In the 1964 San Francisco earthquake, for example, the hypocenter was located about 1 kilometers below the surface, just west of the San Francisco peninsula.

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