A fracture zone is a linear oceanic feature--often hundreds, even thousands of
kilometers long--resulting from the action of offset
mid-ocean ridge axis segments. They are a consequence of
plate tectonics. Lithospheric plates on either side of an active
transform fault move in opposite directions; here,
strike-slip activity is possible. Fracture zones extend past the transform faults, away from the ridge axis; seismically inactive (because both plate segments are moving in the same direction), they display evidence of past transform fault activity.
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