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How many magnitude values does a single earthquake have?

  • A.One for each recording station
  • B.One for each affected town
  • C.One for every hour after the event
  • D.One

Answer: D

Correct answer: One

Magnitude is a property of the source: it describes the size of the rupture, so there is one value for the earthquake however many stations record it. In practice different stations give slightly different estimates and the reported figure is an average, but that is measurement scatter. Intensity is the quantity that legitimately differs from place to place.

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