The focus is where an earthquake initiates within the Earth, while the epicenter is the point directly above the focus on the Earth's surface.
Focus: The focus, also known as hypocenter, is the point within the Earth where an earthquake starts due to rock displacement.
Epicenter: The epicenter is the location on the Earth's surface directly above the focus, where the seismic waves reach the surface.
Difference: The focus is where the earthquake initiates underground, while the epicenter is the point on the surface directly above the focus.
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