High‐resolution image of the oceanic moho in the subducting Nazca Plate from P‐S converted waves
High‐resolution image of the oceanic moho in the subducting Nazca Plate from P‐S converted waves
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P-S 转换波俯冲纳斯卡板块海洋莫霍面的高分辨率图像
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
G. Asch
中科院分区：
文献类型：
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作者：
G. Bock;B. Schurr;G. Asch
智利北方纳斯卡板块下降的海洋莫霍面在24°S的短周期P-S转换波的轮廓。与当地临时地震台网获得的震源位置比较表明，纳斯卡板块俯冲洋岩石圈内的地震主要位于70至120公里深度的洋壳内，可能在120公里以下深度的上地幔内。结果表明，作为中深地震机制的脱水脆化作用在俯冲岩石圈的前洋壳和上地幔都很活跃。
Short‐period P‐S converted waves outline the oceanic Moho of the descending Nazca plate in northern Chile at 24°S. Comparison with hypocentral locations obtained with temporary local seismic networks show that earthquakes inside the subducting oceanic lithosphere of the Nazca plate are located predominantly in the oceanic crust at depths between 70 and 120 km, and probably in the upper mantle at depths below 120 km. The results suggest that dehydration embrittlement as mechanism for intermediate‐depth earthquakes is active both in the former oceanic crust and upper mantle of subducting lithosphere.