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首页> 外文期刊>Geochemistry, geophysics, geosystems >Anisotropic low-velocity lower crust beneath the northeastern margin of Tibetan Plateau: Evidence for crustal channel flow
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Anisotropic low-velocity lower crust beneath the northeastern margin of Tibetan Plateau: Evidence for crustal channel flow

机译：青藏高原东北缘下的各向异性低速下地壳：地壳通道流动的证据

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摘要

Detailed seismic structure in the crust beneath the northeastern margin of Tibetan Plateau was revealed by receiver functions of a regional permanent seismic network. At most stations, negative P-to-S converted phases can be detected in the radial receiver functions, prior to the Moho phases, indicating low velocities in the midlower crust. Prominent azimuthal variations in the transverse receiver functions with polarity reversal suggest azimuthal anisotropy in the crust. We used time variations of the P-to-S converted phases at the Moho in the radial receiver functions and the azimuth-weighted stacking of transverse receiver functions to determine the fast direction and magnitude of anisotropy. The low-velocity midlower crust with the coherent azimuthal anisotropy in the northeastern margin of Tibetan Plateau is consistent with the lower crustal channel flow model.
机译：青藏高原东北缘下方地壳的详细地震结构通过区域永久性地震网络的接收器功能得以揭示。在大多数台站，在莫霍相位之前，可以在径向接收器功能中检测到负的P-S转换相位，这表明中下地壳的速度较低。横向接收器功能中明显的方位角变化以及极性反转提示地壳中的方位角各向异性。我们在径向接收器函数和横向接收器函数的方位角加权叠加中使用了Moho处P-S转换相位的时间变化来确定各向异性的快速方向和幅度。青藏高原东北缘低速中下地壳具有相干方位各向异性，与下地壳河道流动模型相吻合。

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