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Transform faults are strike-slip faults that form segments of lithospheric plate boundaries. Transcurrent faults are strike slip faults that are regional in scale in continental crust but are not necessarily parts of plate margins. Most transform faults are within oceanic crust, but they may occur along continental margins (e.g. the San Andreas fault, or Alpine fault). The faults that disrupt ridges are more common than those that affect trenches, like the two examples mentioned above.