J. Watterson, C. Childs, J. J. Walsh; Widening of fault zones by erosion of asperities formed by bed-parallel slip. Geology ; 26 (1): 71–74. doi: https://doi.org/10.1130/0091-7613(1998)026<0071:WOFZBE>2.3.CO;2
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Faulting imposes strains on wall-rock volumes. In suitably bedded sequences, wall-rock strains are partly accommodated by bed-parallel slip. Bed-parallel slip may displace fault zone margins, giving rise to fault-surface asperities that are sheared off during subsequent fault slip. The removal of asperities formed by bed-parallel slip can make a significant contribution to fault zone thickness.