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Peak ground displacement is dominated by

  • A.the highest frequencies present in the record
  • B.the total duration of the strong shaking
  • C.the number of zero crossings in the trace
  • D.the low-frequency content of the motion

Answer: D

Integrating twice suppresses high frequencies and emphasises long periods, so displacement is a long-period measure. It is also the parameter most corrupted by baseline error, which is why it is the least reliably determined of the three.

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