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The statement the epicentre is a point inside the earth is

  • A.true, but only for deep focus earthquakes
  • B.false, since the epicentre is a line, not a point
  • C.false, since the epicentre lies on the surface
  • D.true, since it is where rupture begins

Answer: C

Correct answer: false, since the epicentre lies on the surface

The epicentre is by definition a point on the ground surface, vertically above the focus. It is the focus that lies inside the earth and where rupture begins. The two terms are constantly interchanged in casual reporting, and the distinction matters because focal depth is one of the main controls on how damaging a given magnitude turns out to be.

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