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The velocity of S waves in a given rock is roughly

  • A.equal to the P wave velocity
  • B.twice the P wave velocity
  • C.one tenth of the P wave velocity
  • D.60 per cent of the P wave velocity

Answer: D

The ratio depends on Poisson's ratio and comes out near 0.6 for common rock, so a P wave at about 6 km/s goes with an S wave near 3.5 km/s. The growing gap between arrivals with distance is what makes the S minus P interval useful.

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