Subducted oceanic asthenosphere and upper mantle flow beneath the Juan de Fuca slab
Subducted oceanic asthenosphere and upper mantle flow beneath the Juan de Fuca slab
复制标题
胡安德富卡板片下方俯冲的海洋软流圈和上地幔流
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
R. Russo
中科院分区：
文献类型：
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作者：
R. Russo
许多研究表明，典型的大洋岩石圈下面是一个发育良好的软流圈，其特征是从~100 - 250 km深度的慢地震速度。然而，大洋软流圈在俯冲带的命运知之甚少。我在这里使用剪切波分裂的S波产生的地震在胡安德富卡板，上地幔软流圈各向异性板下是一致的存在两个不同的俯冲软流圈层，一个快速剪切趋势平行于俯冲沟，第二，更深的一层，快速上地幔织物平行于运动的胡安德富卡板块相对于更深的地幔。未俯冲的太平洋软流圈各向异性在当前板块运动方向上的一致取向意味着当岩石圈俯冲时，海沟平行的板下各向异性发展。
Many studies have shown that typical oceanic lithosphere is underlain by a well-developed asthenosphere characterized by slow seismic velocities from ~100 to 250 km depth. However, the fate of the oceanic asthenosphere at subduction zones is poorly understood. I show here using shear-wave splitting of S waves emanating from earthquakes in the Juan de Fuca slab that upper mantle asthenospheric anisotropy beneath the slab is consistent with the presence of two distinct subducted asthenospheric layers, one with fast shear trends parallel to the subduction trench, and a second, deeper layer with fast upper mantle fabrics parallel to the motion of the Juan de Fuca plate with respect to the deeper mantle. The consistent orientation of unsubducted Pacific asthenospheric anisotropy in the direction of current plate motion implies that the trench-parallel, subslab anisotropy develops when the lithosphere subducts.
影响因子：
64.8
作者：
Hoernle, Kaj;Abt, David L.;Strauch, Wilfried
通讯作者：
Strauch, Wilfried