Abstract
The diffraction effects of a double-deformation fault (extrinsic fault) are readily derived for small faulting probabilities by using a faulted sequence with a layer added and subtracted. Let α′ and α″ be the probabilities for single- and double-deformation faults. If both types of faulting are present, with α′ and α″ both small and independent, the peak broadening depends upon α′+α″, the peak shift depends upon α′−α″, and there is a peak asymmetry proportional to α″ which is similar to that produced by twin faulting.

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