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首页> 外文期刊>Journal of geodynamics >Bending-related faulting of the incoming oceanic plate and its effect on lithospheric hydration and seismicity: A passive and active seismological study offshore Maule, Chile
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Bending-related faulting of the incoming oceanic plate and its effect on lithospheric hydration and seismicity: A passive and active seismological study offshore Maule, Chile

机译：传入洋板的弯曲相关断层及其对岩石圈水化和地震活动的影响：智利莫勒近海的被动和主动地震研究

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摘要

We have studied the dependency between incoming plate structure, bending-related faulting, lithospheric hydration, and outer rise seismic activity offshore Maule, Chile. We derived a 2D Poisson's ratio distribution from P- and S-wave seismic wide angle data collected in the trench-outer rise. High values of Poisson's ratio in the uppermost mantle suggest that the oceanic lithosphere is highly hydrated due to the water infiltration through bending-related normal faults outcropping at the seafloor. This process is presumably facilitated by the presence of a seamount in the area. We conclude that water infiltrates deep into the lithosphere, when it approaches the Chile trench, producing a reduction of crustal and upper mantle velocities, supporting serpentinization of the upper mantle. Further, we observed a mantle Vp anisotropy of 8%, with the fast velocity axis running normal to the abyssal hill fabric and hence in spreading direction, indicating that outer rise processes have yet not affected anisotropy.
机译：我们研究了智利莫勒近海传入板块结构，弯曲相关断层，岩石圈水化和外部上升地震活动之间的相关性。我们从在沟外上升中收集的P和S波地震广角数据推导出了二维泊松比分布。最上层地幔中的泊松比值很高，这表明由于岩石的弯曲相关正断层在海底露头渗入水，海洋岩石圈被高度水化。据推测，该过程是由于该地区存在海山而促进的。我们得出的结论是，当水接近智利海沟时，水会渗透到岩石圈深处，从而降低地壳和上地幔的速度，从而支持上地幔的蛇形化。此外，我们观察到地幔Vp各向异性为8％，快速速度轴垂直于深渊丘陵织物，因此沿传播方向延伸，这表明外部上升过程尚未影响各向异性。

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