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The distance from a station to an earthquake is estimated from the

  • A.amplitude of the largest surface wave
  • B.duration of the whole seismogram
  • C.absolute time at which the P wave arrives
  • D.interval between the P and S arrivals

Answer: D

Because the two waves travel at different speeds, the gap between them grows steadily with distance, so the interval is a direct measure of it. Using the absolute arrival time would require knowing the origin time, which is not yet known.

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