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Oceanic mantle reflections in deep seismic profiles offshore Sumatra are faults or fakes ArchiMer
Sibuet, Jean-claude; He, Enyuan; Zhao, Minghui; Pang, Xinming; Klingelhoefer, Frauke.
In the late 90's, some faults identified within oceanic crust were demonstrated to be artifacts arising from out-of-plane scattering along linear sediment-buried fault scarps. Symmetrical mantle reflections observed southwest northern Sumatra on seismic reflection profiles have been identified as faults cutting through the upper mantle down to unprecedented depths reaching similar to 45 km. Seawater being conveyed along sub-vertical re-activated fracture zones (FZs) to the upper mantle, the mantle portions of FZs are serpentinized and act as mirrors for seismic rays. We suggest that the mantle features are not faults but artifacts resulting from out-of-plane reflections on these mirrors. Two perpendicular seismic profiles crossing the same FZ display two...
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Ano: 2019 URL:
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