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Duration of shaking generally increases with

  • A.the height of the structure being considered
  • B.magnitude of the earthquake
  • C.the stiffness of the rock at the site
  • D.the depth of the water table below ground

Answer: B

Correct answer: magnitude of the earthquake

Duration is governed chiefly by the length of time the fault takes to rupture, which grows with the size of the rupture and hence with magnitude. A magnitude 6 event may shake strongly for ten seconds, a magnitude 9 for several minutes. Distance and site conditions lengthen it further, but magnitude is the primary control.

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