define seismic focus.
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A seismic focus is the point inside the earth which is the origin of earthquake shocks whereas the. epicentre is the point on the surface of the earth which is vertically above the seismic focus
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The place of origin within the Earth of an earthquake; usually some more or less restricted area of a fault surface. If the focus is to be some particular point, it is the central point of the area over which fault movement occurred and caused the earthquake.
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