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Transcurrent Tectonics: Some Complications...
Strike-slip faults, as any other faults, are far form being simple planar surface. Instead most faults correspond to irregular segmented surfaces with sharp changes in direction. These sharp changes in direction are induced by small pre-shearing anomalies such as pre-existing faults or joints.
The sketches on the right show map views of structures that develop along strike-slip faults. As one can see contractional (push-up, contractional duplex) and extensional structures (pull-apart, extensional duplex, shear lens) may develop in the vicinity of strike-slip faults. Below are examples of contractional and extensional duplexes.