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Reservoir-induced seismicity is attributed to

  • A.added water load and increased pore pressure on faults
  • B.the weight of the dam structure alone
  • C.chemical action of stored water on rock
  • D.vibration produced by turbines in the powerhouse

Answer: A

Impounding a deep reservoir both loads the crust and raises pore water pressure at depth, which reduces the effective stress holding a fault and can trigger slip that was already close to occurring. The Koyna region in India is the most studied example.

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