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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Seismic anisotropy beneath Cascadia and the Mendocino triple junction: Interaction of the subducting slab with mantle flow
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Seismic anisotropy beneath Cascadia and the Mendocino triple junction: Interaction of the subducting slab with mantle flow

机译：卡斯卡迪亚和门多西诺三联结下方的地震各向异性：俯冲板与地幔流的相互作用

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摘要

Mantle flow associated with the Cascadia subduction zone and the Mendocino Triple Junction is poorly characterized due to a lack of shear wave splitting studies compared to other subduction zones. To fill this gap data was obtained from the Mendocino and FACES seismic networks that cover the region with dense station spacing. Over a period of 11-18. months, 50 suitable events were identified from which shear wave splitting parameters were calculated. Here we present stacked splitting results at 63 of the stations. The splitting pattern is uniform trench normal (N67°E) throughout Cascadia with an average delay time of 1.25. s. This is consistent with subduction and our preferred interpretation is entrained mantle flow beneath the slab. The observed pattern and interpretation have implications for mantle dynamics that are unique to Cascadia compared to other subduction zones worldwide. The uniform splitting pattern seen throughout Cascadia ends at the triple junction where the fast directions rotate almost 90°. Immediately south of the triple junction the fast direction rotates from NW-SE near the coast to NE-SW in northeastern California. This rotation beneath northern California is consistent with flow around the southern edge of the subducting Gorda slab.
机译：与其他俯冲带相比，由于缺乏剪切波分裂研究，与卡斯卡迪亚俯冲带和门多西诺三汇合点相关的地幔流特征较差。为了填补这一空白，从Mendocino和FACES地震网络获得了数据，这些网络覆盖了密集站距的区域。在11-18期间。几个月，确定了50个合适的事件，从中计算了剪切波分裂参数。在这里，我们展示了63个站点的堆叠拆分结果。分割模式是整个卡斯卡迪亚的均匀沟槽法线（N67°E），平均延迟时间为1.25。 s。这与俯冲作用是一致的，我们的首选解释是板下的夹带地幔流。与全球其他俯冲带相比，观察到的模式和解释对卡斯卡迪亚特有的地幔动力学有影响。在整个卡斯卡迪亚看到的均匀分裂图案终止于三重交界处，快速方向旋转了近90°。在三重交界处以南，快速方向从海岸附近的NW-SE旋转到加利福尼亚东北部的NE-SW。加利福尼亚北部下方的这种旋转与俯冲Gorda平板南部边缘的流动一致。

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