Asperity 1
Asperity 1 : A region on a fault of higher strength than the surroundings, at which stress concentrates prior to fault rupture. In seismology, this term (and also the term barrier) is often used to describe the heterogeneity of a fault. It was first introduced by Lay and Kanamori (1981) to describe regions of earthquake ruptures where relatively high release of seismic moment or release of seismic energy occurs (see barrier; Scholz (2002) or it may refer to locked sections of the fault that cause fault segmentation. An assperity may be produced by one or more of the following conditions: increased normal stress, high friction, low pore pressure, or geometric changes in the fault such as Fault bends, offsets, or roughness
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