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Soft soil overlying rock generally

  • A.reduces the motion and shortens its period
  • B.leaves the motion entirely unaffected
  • C.converts the shear waves into compressional waves
  • D.amplifies the motion and lengthens its period

Answer: D

The slower material carries the same energy at larger amplitude, and the layer resonates at its own longer period. Very soft deep deposits can nonetheless limit the peak acceleration by yielding, while still amplifying long-period motion.

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