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Significant duration is defined from the

  • A.number of peaks exceeding half the maximum value
  • B.interval over which displacement exceeds its mean
  • C.time taken for the record to be fully digitised
  • D.build-up of energy between stated percentages of the total

Answer: D

The cumulative energy of the record is plotted and the interval between, typically, 5 and 95 per cent of the total is taken. Being based on energy rather than one threshold, it is more stable than the bracketed measure.

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