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Which one of the following is NOT an amplitude parameter of ground motion?

  • A.Bracketed duration of strong shaking
  • B.Peak ground acceleration in units of g
  • C.Peak ground velocity in centimetres per second
  • D.Peak ground displacement in centimetres

Answer: A

Correct answer: Bracketed duration of strong shaking

Duration is its own category of parameter, describing how long the shaking lasted rather than how large it was. The three amplitude parameters are peak acceleration, peak velocity and peak displacement. Keeping the categories apart matters because a complete description of a motion needs one parameter from each: amplitude, frequency content and duration.

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