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The statement ground motion at a site is the same for every earthquake of a given magnitude is

  • A.false, because magnitude cannot be measured precisely
  • B.false, because distance, path and site all vary
  • C.true, because magnitude fixes the energy released
  • D.true, provided the focal depth is the same

Answer: B

Magnitude fixes what is released at the source, but what arrives depends on how far the waves travelled, what they passed through and what lies beneath the site. Two equal earthquakes can produce quite different motions at the same place.

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