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Deciding whether a fault is active requires above all

  • A.identifying the minerals in its gouge
  • B.dating the youngest deposits it displaces
  • C.measuring the fault's total length
  • D.determining the fault's dip and hade accurately

Answer: B

Correct answer: dating the youngest deposits it displaces

Activity is a statement about time, so it is settled by finding the youngest material the fault has cut and the oldest that lies undisturbed across it. That brackets the last movement. The fault’s length, dip and gouge tell you about its size and mechanism but nothing about when it last moved.

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