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The frequency content of a ground motion is displayed by its

  • A.isoseismal map covering the affected region
  • B.attenuation relationship for the region
  • C.cumulative distribution of magnitudes
  • D.Fourier amplitude spectrum

Answer: D

Correct answer: Fourier amplitude spectrum

The Fourier amplitude spectrum decomposes the record into its harmonic components and plots the amplitude of each against frequency, so it shows directly which frequencies the motion contains and how strongly. It is a property of the motion itself, unlike a response spectrum, which describes what oscillators do when driven by it.

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