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Discussion

Paleoseismology studies past earthquakes by examining

  • A.instrumental records from the last century
  • B.newspaper reports of felt shaking
  • C.the current rate of plate motion
  • D.geological evidence such as offset sediment layers

Answer: D

Trenching across a fault reveals displaced and buried layers that can be dated, extending the record of large earthquakes back thousands of years. That matters because instrumental records are far shorter than the recurrence intervals of great events.

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