Earthquake Hazards Program
The epicenter is the point on the earth's surface vertically above the hypocenter (or focus), point in the crust where a seismic rupture begins. See also Earthquake ABC.
Epicenter & Hypocenter. (Modified from Charles Ammon, Penn State)
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U.S. Department of the Interior | U.S. Geological Survey
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Page Last Modified: July 24, 2012 17:12:00 UTC