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Site classification in modern codes is based chiefly on

  • A.average shear wave velocity in the upper 30 m
  • B.the compressive strength of a rock core sample
  • C.the depth of the water table below the surface
  • D.the plasticity index of the surface clay layer

Answer: A

Averaging the shear wave velocity over the top 30 metres gives a single number that captures the stiffness of the ground the waves must pass through. Codes group sites into classes on that basis and assign amplification factors to each.

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