Predominantly horizontal relative motion along a fault. A pure strike-slip double couple has two vertical nodal planes; a focal mechanism gives both possible planes, and independent evidence selects the actual one.
Strike-slip faulting in which the opposite side moves to an observer's right when looking across the fault.
Strike-slip faulting in which the opposite side moves to an observer's left when looking across the fault. The sense is the same from either side.
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