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Arias intensity is a measure of

  • A.the interval between two threshold crossings
  • B.the predominant period of the motion
  • C.the total energy content of the record
  • D.the largest single acceleration ordinate

Answer: C

It is obtained by integrating the square of the acceleration over the whole record, so it grows with both amplitude and duration. That makes it a useful single parameter where both matter, as in liquefaction and slope stability assessment.

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