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The point within the earth where an earthquake rupture begins is the

  • A.epicentre
  • B.isoseismal
  • C.antipode
  • D.focus

Answer: D

Correct answer: focus

The focus, or hypocentre, is the point at depth where rupture nucleates. Slip then spreads outward from it over the fault plane, so the focus marks where the earthquake began rather than where most of the energy came from. The epicentre is its projection on the surface, and an isoseismal is a contour of equal intensity drawn on a map.

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