A) The epicenter is calculated after the all the aftershocks of an earthquake are plotted. It is the statistical center of the earthquake. The focus is the spot of first motion of the rocks.
B) The epicenter is where the energy is first released and the focus of the earthquake is where most of the damage is done
C) The focus of the earthquake is were surface waves are first detected while the epicenter is where the P and S waves are detected.
D) The epicenter is the spot on the Earth’s surface directly above the focus.

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