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Earthquake Focus and Epicenter

Description
Locating an earthquake
Focus – the place within Earth where earthquake waves originate
Epicenter
Point on the surface, directly above the focus
Located using the difference in the arrival times between P and S wave recordings, which are related to distance

Locating an earthquake
Epicenter
Three station recordings are needed to locate an epicenter
Circle equal to the epicenter distance is drawn around each station
Point where three circles intersect is the epicenter
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