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Seismic anisotropy of the crust and upper mantle beneath western Tibet revealed by shear wave splitting measurements
Ju, CH (Ju, Changhui)1,3; Zhao, JM (Zhao, Junmeng)1,2,3; Huang, N (Huang, Ning)4; Xu, Q (Xu, Qiang)1,2; Liu, HB (Liu, Hongbing)1,2
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
2019
Volume216Issue:1Pages:535-544
DOI10.1093/gji/ggy448
Abstract

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.

Subject AreaGeosciences
WOS IDWOS:000465363500035
Language英语
Indexed BySCI
KeywordIndian Lithosphere Beneath Plateau Subduction Deformation Slab Himalaya
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国内
ISSN0956-540X
Department大陆碰撞与高原隆升
URL查看原文
PublisherOXFORD UNIV PRESS
SubtypeArticle
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9445
Collection图书馆
Corresponding AuthorJu, CH (Ju, Changhui)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China;
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China;
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China;
4.Yingtai Oil Prod Plant Jilin Oil Field, Inst Geopl, Songyuan 138000, Peoples R China.
Recommended Citation
GB/T 7714
Ju, CH ,Zhao, JM ,Huang, N ,et al. Seismic anisotropy of the crust and upper mantle beneath western Tibet revealed by shear wave splitting measurements[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2019,216(1):535-544.
APA Ju, CH ,Zhao, JM ,Huang, N ,Xu, Q ,&Liu, HB .(2019).Seismic anisotropy of the crust and upper mantle beneath western Tibet revealed by shear wave splitting measurements.GEOPHYSICAL JOURNAL INTERNATIONAL,216(1),535-544.
MLA Ju, CH ,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):535-544.
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