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An accelerogram recorded on rock is used with a site response analysis in order to

  • A.estimate the magnitude of the earthquake
  • B.locate the epicentre more accurately
  • C.determine the duration of the aftershocks
  • D.obtain the motion expected at the soil surface

Answer: D

Correct answer: obtain the motion expected at the soil surface

A site response analysis takes the rock motion as input at the base of the soil column and propagates it upward through layers whose stiffness and damping vary with strain, producing the motion at the surface. That surface motion may be several times the rock motion and at a longer predominant period, and it is what the structure will actually experience.

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