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Complex deformation in western Tibet revealed by anisotropic tomography
Zhang, H (Zhang, Heng)1,2; Zhao, JM (Zhao, Junmeng)1,3; Zhao, DP (Zhao, Dapeng)4; Yu, CQ (Yu, Chunquan)2; Liu, HB (Liu, Hongbing)1,3; Hu, ZG (Hu, Zhaoguo)5; Zhang, H
AbstractThe mechanism and pattern of deformation beneath western Tibet are still an issue of debate. In this work we present 3-D P- and S-wave velocity tomography as well as P-wave radial and azimuthal anisotropy along the ANTILOPE-I profile and surrounding areas in western Tibet, which are determined by using a large number of P and S arrival-time data of local earthquakes and teleseismic events. Our results show that low-velocity (low-V) zones exist widely in the middle crust, whereas low-V zones are only visible in the lower crust beneath northwestern Tibet, indicating the existence of significant heterogeneities and complex flow there. In the upper mantle, a distinct low-V gap exists between the Indian and Asian plates. Considering the P-and S-wave tomography and P-wave azimuthal and radial anisotropy results, we interpret the gap to be caused mainly by shear heating. Depth-independent azimuthal anisotropy and high-velocity zones exist beneath the northern part of the study region, suggesting a vertically coherent deformation beneath the Tarim Basin. In contrast, tomographic and anisotropic features change with depth beneath the central and southern parts of the study region, which reflects depth-dependent (or decoupled) deformations there. At the northern edge of the Indian lithospheric mantle (ILM), P-wave azimuthal anisotropy shows a nearly east-west fast-velocity direction, suggesting that the ILM was re-built by mantle materials flowing to the north. (C) 2016 Elsevier B.V. All rights reserved.
Subject Area地球物理学
WOS IDWOS:000382595500010
Indexed BySCI
KeywordBeneath Central Tibet India-asia Collision P-wave Continental Deformation Seismic Anisotropy Upper-mantle Evolution Crustal Faults Japan
Cooperation Status国际
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Document Type期刊论文
Corresponding AuthorZhang, H
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Lab Continental Collis & Plateau Uplift, Beijing 100085, Peoples R China
2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 01239 USA
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Tohoku Univ, Dept Geophys, Sendai, Miyagi 9808578, Japan
5.China Cent Bur Met & Geol, Shandong Zhengyuan Inst Geol Explorat, Jinan 250000, Peoples R China
Recommended Citation
GB/T 7714
Zhang, H ,Zhao, JM ,Zhao, DP ,et al. Complex deformation in western Tibet revealed by anisotropic tomography[J]. EARTH AND PLANETARY SCIENCE LETTERS,2016,451(0):97-107.
APA Zhang, H .,Zhao, JM .,Zhao, DP .,Yu, CQ .,Liu, HB .,...&Zhang, H.(2016).Complex deformation in western Tibet revealed by anisotropic tomography.EARTH AND PLANETARY SCIENCE LETTERS,451(0),97-107.
MLA Zhang, H ,et al."Complex deformation in western Tibet revealed by anisotropic tomography".EARTH AND PLANETARY SCIENCE LETTERS 451.0(2016):97-107.
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