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Fling step in a near-fault record refers to

  • A.permanent ground displacement from the fault slip
  • B.the highest frequency spike in the acceleration
  • C.the interval between two threshold crossings
  • D.the reduction of motion caused by soft soil

Answer: A

Correct answer: permanent ground displacement from the fault slip

Fling step is the static offset the ground acquires because the fault has moved: it appears in a near-fault record as a one-sided pulse in the velocity trace and a permanent step in the displacement. It is distinct from forward directivity, which is a large but transient pulse, and both are near-fault phenomena absent at distance.

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