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Ground motion during an earthquake is

  • A.purely vertical at all locations
  • B.constant in amplitude for its whole duration
  • C.three-dimensional and irregular in time
  • D.a smooth sinusoid of constant amplitude

Answer: C

Correct answer: three-dimensional and irregular in time

A real ground motion has two horizontal components and a vertical one, all irregular, all changing in amplitude and frequency from instant to instant. The idealisations used in analysis - a single horizontal component, a smooth design spectrum - are convenient simplifications of this, and the difference is why recorded motions are used for verification.

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