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If a site has a design earthquake with a return period of 475 years, the annual probability of exceedance is closest to

  • A.0.0021
  • B.0.021
  • C.0.21
  • D.475

Answer: A

The annual probability is the reciprocal of the return period, so 1 divided by 475 is about 0.0021, which is the familiar 10 per cent chance in 50 years. Confusing the return period with a probability is the error the alternatives represent.

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