Seismic Anisotropy: Tracing Plate Dynamics in the Mantle
Seismic Anisotropy: Tracing Plate Dynamics in the Mantle
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DOI：
10.1126/science.1067319
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发表时间：
2002-04
期刊：
影响因子：
56.9
通讯作者：
Jeffrey Park;V. Levin
中科院分区：
文献类型：
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作者：
Jeffrey Park;V. Levin
弹性各向异性存在于地震波的速度取决于其方向的地方。在地球地幔中，弹性各向异性是由优先定向流动或变形的矿物引起的。地震产生两种地震波类型：压缩（P）和剪切（S）波，其在各向异性岩石中的耦合导致散射，双折射和混合偏振波。这种不同的行为有助于地球物理学家探索地幔和地壳内的岩石结构，绘制当今上地幔对流的地图，并研究岩石圈板块的形成和地球历史上大陆的增生。
Elastic anisotropy is present where the speed of a seismic wave depends on its direction. In Earth's mantle, elastic anisotropy is induced by minerals that are preferentially oriented in a directional flow or deformation. Earthquakes generate two seismic wave types: compressional (P) and shear (S) waves, whose coupling in anisotropic rocks leads to scattering, birefringence, and waves with hybrid polarizations. This varied behavior is helping geophysicists explore rock textures within Earth's mantle and crust, map present-day upper-mantle convection, and study the formation of lithospheric plates and the accretion of continents in Earth history.