Fracture zones

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  • Fracture Zones
definition
  • Fracture zones are large, linear zone of irregular bathymetry of the sea floor, characterized by asymmetric ridges and troughs. Fracture zones are the topographic expression of transform faults, faults with horizontal displacement connecting the ends of an offset in a mid-ocean ridge.
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Abstract from DBPedia
    A fracture zone is a linear feature on the ocean floor—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 occurs. 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, primarily in the different ages of the crust on opposite sides of the zone. In actual usage, many transform faults aligned with fracture zones are often loosely referred to as "fracture zones" although technically, they are not.

    断裂帯(だんれつたい、英: fracture zone)とは、海底地形が極めて不連続となっている崖状・溝状の巨大な海底断層崖であり、トランスフォーム断層による地殻の不連続の延長上の海底に見られる。すなわち、トランスフォーム断層の外側の痕跡部分にあたる。中央海嶺から出て、それに直交する方向に直線状に伸びる。地殻の最上部地帯にあたる。大洋底の拡大に伴って伸びた亀裂であると考えられている。大規模なものは、特に太平洋東部に多い。狭義の断裂帯は、トランスフォーム断層の痕跡にすぎず、地震はほとんど発生しない。

    (Source: http://dbpedia.org/resource/Fracture_zone)