Define Sesmic Focus
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earthquakes. In earthquake: Principal types of seismic waves. …the Earth, is called the focus, or hypocentre. The point at the surface immediately above the focus is known as the epicentre.
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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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