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Power spectral density of a ground motion describes how its

  • A.peak value depends on the site soil type
  • B.energy is distributed with frequency
  • C.amplitude decays with distance from the source
  • D.duration varies with the magnitude

Answer: B

Correct answer: energy is distributed with frequency

The power spectral density gives the mean square amplitude per unit frequency, so its integral over a band is the energy the motion carries in that band. It is the statistical counterpart of the Fourier amplitude spectrum and is used where the motion is treated as a random process, as in stochastic response analysis.

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