Crustal azimuthal anisotropy and deformation beneath the northeastern Tibetan Plateau and adjacent areas: Insights from receiver function analysis
Crustal azimuthal anisotropy and deformation beneath the northeastern Tibetan Plateau and adjacent areas: Insights from receiver function analysis
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青藏高原东北部及邻近地区地壳方位各向异性和变形：接收函数分析的见解
DOI：
10.1016/j.tecto.2021.229014
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发表时间：
2021-10
期刊：
影响因子：
2.9
通讯作者：
Youqiang Yu
中科院分区：
文献类型：
--
作者：
Tuo Zheng;Stephen S. Gao;Zhifeng Ding;Kelly H. Liu;Lijun Chang;Xiaoping Fan;Fansheng Kong;Youqiang Yu
地壳各向异性震级为0.15 ~ 0.75 s，平均为0.36±0.11 s。阿拉善地块西部的地壳各向异性特征与受印-欧亚碰撞影响的地区相似，而阿拉善地块东部的各向异性特征与稳定的华北克拉通相似。
We present crustal azimuthal anisotropy measurements at 246 stations by fitting the sinusoidal moveout of P-to-S receiver functions to infer crustal deformation field in the northeastern (NE) Tibetan Plateau and adjacent areas. The dominant orientation of the observed crustal anisotropy shows a systematic spatial variation: NW-SE in the NE Tibetan Plateau and western Alxa Block, nearly NE-SW in the eastern Alxa Block and Yinchuan-Hetao Graben, and E-W in the eastern portion of the Western Qinling Terrane. The magnitude of crustal anisotropy varies from 0.15 to 0.75 s with an average of 0.36 ± 0.11 s. Fault parallel crustal anisotropy with large magnitudes observed in the NE Tibetan Plateau provides independent constraints on the lateral extent of the deformation zone associated with the faults. The observed spatial distribution of crustal anisotropy, when combined with previous crustal velocity and Poisson's ratio measurements, implies that channel flow in the middle-to-lower crust is unlikely to exist beneath the NE Tibetan Plateau. The main characteristics of crustal anisotropy observed in the western Alxa Block are similar to areas affected by the Indo-Eurasian collision, while those observed in the eastern Alxa Block are comparable to the stable North China Craton.
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