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An increase of one unit of magnitude corresponds to an energy release greater by a factor of about

  • A.1000
  • B.32
  • C.10
  • D.2

Answer: B

Energy rises as roughly the three-halves power of the amplitude ratio, giving about thirty-two times per magnitude unit and about a thousand times for two units. That is why a magnitude 8 event dwarfs a magnitude 6 rather than merely exceeding it.

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