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The three amplitude parameters commonly used to describe a ground motion are

  • A.peak acceleration, peak velocity and peak displacement
  • B.magnitude, intensity and the focal depth of the event
  • C.duration, frequency and the number of recording stations
  • D.epicentral distance, hypocentral distance and the azimuth

Answer: A

Correct answer: peak acceleration, peak velocity and peak displacement

These are the three amplitude parameters, and each is dominated by a different part of the frequency range - acceleration by high frequencies, displacement by low, velocity by the middle. Magnitude and intensity describe the earthquake and its effects rather than the record, and duration and frequency content are separate categories of parameter.

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