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Seismic refraction fails where a layer of low velocity lies

  • A.at the ground surface above bedrock
  • B.at a depth greater than the survey line length
  • C.beneath one of higher velocity
  • D.above one of much higher velocity

Answer: C

The method assumes velocity increasing with depth, so a soft layer under a stiff crust is a hidden layer that the travel times cannot reveal. A weathered zone beneath a hard cap is the classic case and a dangerous one.

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