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Seismic hazard assessment differs from earthquake prediction in that it gives

  • A.the probability of shaking over a long period
  • B.the date and time of the next earthquake
  • C.the magnitude of the next event exactly
  • D.the number of casualties to be expected

Answer: A

Correct answer: the probability of shaking over a long period

Hazard assessment answers a probabilistic question: what level of ground motion has a given chance of being exceeded at this site in fifty years, or in the design life of the structure. It is what codes are written from. Prediction, which would name the place, time and size of a specific future event, remains beyond reach, and the two should never be confused.

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