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A ground motion prediction equation estimates a motion parameter from

  • A.the number of aftershocks that followed
  • B.the height and stiffness of the structure
  • C.magnitude, distance and site conditions
  • D.the intensity reported by observers in the area

Answer: C

Correct answer: magnitude, distance and site conditions

A ground motion prediction equation is a regression fitted to recorded data, expressing a parameter such as peak acceleration or a spectral ordinate as a function of magnitude, source-to-site distance and a site classification, often with terms for style of faulting and for near-fault effects. It is the engine of hazard analysis, converting a postulated earthquake into an expected motion.

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