Seismic anisotropy in western Tibet
Seismic anisotropy in western Tibet
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DOI：
10.1029/2005gl023561
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发表时间：
2005-09
影响因子：
5.2
通讯作者：
G. Herquel;P. Tapponnier
中科院分区：
文献类型：
--
作者：
G. Herquel;P. Tapponnier
分析了由横跨西藏西部的临时宽带台阵收集的TeleseopticalSKS数据，以约束剪切波分裂参数。在叶城以西的塔里木盆地，快轴方位角从40°E旋转到和田至狮泉河之间的偏东值。要将与昆仑山和喀喇昆仑山垂直的快轴方向与俯冲作用引起的地壳剪切联系起来，需要地壳各向异性的巨大贡献。叶城以北的快轴可能反映了塔里木岩石圈冻结的元古代应变。和田以南的东西走向可能与沿阿尔金断裂沿着的左旋剪切有关。该断裂以南的快轴方向可能反映了西藏相对于亚洲的北东向运动。
Teleseismic SKS data collected by a temporary broadband array across western Tibet are analysed to constrain shear‐wave splitting parameters. Small delay anisotropy is detected, with a rotation of the fast axis azimuth from 40°E in the Tarim basin west of Yecheng to more easterly values between Hotien and Shiquanhe. A large contribution of crustal anisotropy would be required to link fast axis directions orthogonal to the Kunlun and Karakorum ranges with crustal shear due to underthrusting. The fast axes north of Yecheng may instead reflect frozen Proterozoic strain in the Tarim lithosphere. The E‐W direction south of Hotien may be related to sinistral shear along the Altyn Tagh fault. It is possible that fast axes directions south of this fault reflect northeastwards motion of Tibet relative to Asia.