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Approximately plane surface of fracture in a rock body, caused by brittle failure, and along which observable relative displacement has occurred between adjacent blocks. Most faults may be broadly classified according to the direction of slip of adjacent blocks into dip-slip, strike-slip, and oblique-slip varieties. The term ‘dip-slip fault’ comprises both normal and reverse slip faults, and the special cases of low-angle lag and thrust faults. Strike-slip faults (wrench, transform, transcurrent) result from horizontal displacement (dextral or sinistral movements), and on a regional scale may involve transpression and transtension. See also voids.

Subjects: Earth Sciences and Geography — Environmental Science.

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