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Focal depth is the distance from the

  • A.focus to the centre of the earth
  • B.focus to the epicentre
  • C.focus to the nearest seismograph
  • D.epicentre to the site of interest

Answer: B

It is measured vertically from the point of rupture up to the surface, and it governs how concentrated the shaking is. A shallow focus delivers its energy to a small area and does far more damage than a deep one of the same magnitude.

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