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Near-field ground motions differ from far-field motions in commonly showing

  • A.a much longer duration of weak shaking
  • B.energy concentrated at very long periods only
  • C.an almost complete absence of vertical motion
  • D.a large single velocity pulse

Answer: D

Close to the rupture the motion can contain one strong pulse that demands a large displacement in a single excursion, which is severe for structures and for isolation systems. Far-field motions are more nearly random and longer.

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