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DOI	10.1093/gji/ggy448
	Seismic anisotropy of the crust and upper mantle beneath western Tibet revealed by shear wave splitting measurements
	Ju, Changhui; Zhao, Junmeng; Huang, Ning; Xu, Qiang; Liu, Hongbing
通讯作者	Ju, CH (通讯作者)
发表日期	2019
ISSN	0956-540X
EISSN	1365-246X
起始页码	535
结束页码	544
卷号	216 期号:1
英文摘要	We investigate the seismic anisotropy of the crust and upper mantle beneath western Tibet at 31 stations from the temporary Y2 experiment operated from 2007 to 2011 using teleseismic shear wave splitting measurements. Assuming a single-layer anisotropic model, we obtain 803 pairs of SKS splitting parameters represented by fast polarization directions and delay times. Our observations exhibit either an ENE-WSW or nearly E-W trend of stacking fast polarization directions with average delay times from 0.4 to 1.43 s except for those close to similar to 82 degrees E, which present the N-S oriented fast polarization directions with delay times of about 1.0 s. The ENE-WSW or nearly E-W trending fast polarization directions found along the Karakoram fault and the Bangong-Nujiang suture are compatible with other seismic anisotropy observations beneath western Tibet, and could have resulted from the mantle flow in the asthenosphere. The nearly N-S trending fast orientation directions in the southeastern part of the array, just above the underlying fast shear wave anomaly beneath the Indus-Yarlung suture, can be explained by C-type olivine fabric from the underthrusting Indian mantle lithosphere and/or sub-ILM orientated asthenospheric flow. Our measurements suggest decoupling between the crust and mantle lithosphere below western Tibet and the changing behaviour of the Indian lithospheric mantle from slab-like underthrusting beneath the Karakoram fault to underplating at similar to 82 degrees E.
关键词	INDIAN LITHOSPHERE BENEATH PLATEAU SUBDUCTION DEFORMATION SLAB HIMALAYA
英文关键词	Asia; Seismic anisotropy; Continental margins: convergent; Dynamics of lithosphere and mantle; Kinematics of crustal and mantle deformation
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000465363500035
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259481
推荐引用方式 GB/T 7714	Ju, Changhui,Zhao, Junmeng,Huang, Ning,et al. Seismic anisotropy of the crust and upper mantle beneath western Tibet revealed by shear wave splitting measurements[J]. 中国科学院青藏高原研究所,2019,216(1).
APA	Ju, Changhui,Zhao, Junmeng,Huang, Ning,Xu, Qiang,&Liu, Hongbing.(2019).Seismic anisotropy of the crust and upper mantle beneath western Tibet revealed by shear wave splitting measurements.GEOPHYSICAL JOURNAL INTERNATIONAL,216(1).
MLA	Ju, Changhui,et al."Seismic anisotropy of the crust and upper mantle beneath western Tibet revealed by shear wave splitting measurements".GEOPHYSICAL JOURNAL INTERNATIONAL 216.1(2019).