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An active fault is generally defined as one that has

  • A.been mapped by more than one survey
  • B.moved in the recent geological past
  • C.any visible expression at the ground surface
  • D.never produced an earthquake in recorded history

Answer: B

Definitions vary but all rest on evidence of movement within a stated recent period, commonly the Holocene or Quaternary, on the reasoning that a fault that has moved recently may move again. Surface expression is useful evidence but not the criterion.

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