Question

what is focus?
a.center of the earth
b.end of the seismic waves
c.surface of the earth where the wave starts
d.location where an earthquake's waves begin
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Answer 1

Answer:

The point within the earth where the fault rupture starts is called the focus or hypocenter. This is the exact location within the earth were seismic waves are generated by sudden release of stored elastic energy. The epicenter is the point on the surface of the earth directly above the focus.

Option B.

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