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Peak ground velocity is generally a better index than peak acceleration for

  • A.estimating the magnitude of the earthquake
  • B.locating the epicentre of the earthquake
  • C.intermediate and long-period structures
  • D.very short-period rigid structures on rock

Answer: C

Correct answer: intermediate and long-period structures

Peak velocity is governed by the intermediate frequencies, which is where the energy that matters to medium and long-period structures lies. Peak acceleration is dominated by very high frequencies, whose brief spikes shake a stiff structure but carry little energy for a flexible one, so it correlates poorly with damage to taller buildings.

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