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Which one of the following is NOT normally used as a ground motion parameter?

  • A.Bracketed duration of strong shaking
  • B.Arias intensity of the record
  • C.The number of stations that recorded the event
  • D.Peak ground velocity

Answer: C

Correct answer: The number of stations that recorded the event

How many instruments happened to be operating is a property of the network, not of the motion, and it tells you nothing about what the ground did at a site. The other three are all genuine parameters: bracketed duration measures how long, Arias intensity how much energy, and peak ground velocity how large the intermediate-frequency motion was.

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