Define and distinguish between the following: epicenter, focus, foreshock, aftershock
What will be an ideal response?
The subsurface area where the motion of seismic waves is initiated along a fault plane is the focus (or hypocenter). The area at the surface directly above the focus is the epicenter. A foreshock is a quake that precedes the main shock. An aftershock occurs after the main shock, sharing the same general area of the epicenter.
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What will be an ideal response?