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In a strike-slip fault the movement is

  • A.vertical and parallel to the fault dip
  • B.obliquely upward along the fault plane
  • C.purely rotational about a vertical axis
  • D.horizontal and parallel to the fault strike

Answer: D

Correct answer: horizontal and parallel to the fault strike

Strike is the horizontal direction of the fault trace, and on a strike-slip fault the two blocks slide past each other along it with little or no vertical component. The crust is neither shortened nor lengthened, only sheared. The San Andreas is the classic example, and such faults often show a long, remarkably straight surface trace.

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