气候变化领域集成服务门户(CCPortal): Complex deformation in western Tibet revealed by anisotropic tomography

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DOI	10.1016/j.epsl.2016.07.020
	Complex deformation in western Tibet revealed by anisotropic tomography
	Zhang, Heng; Zhao, Junmeng; Zhao, Dapeng; Yu, Chunquan; Liu, Hongbing; Hu, Zhaoguo
通讯作者	Zhang, H (通讯作者)
发表日期	2016
ISSN	0012-821X
EISSN	1385-013X
起始页码	97
结束页码	107
卷号	451
英文摘要	The 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.
关键词	P-WAVE SEISMIC ANISOTROPY UPPER-MANTLE BENEATH CRUSTAL EVOLUTION FAULT LITHOSPHERE KARAKORAM EXTENSION
英文关键词	anisotropic tomography; Tibetan plateau; lateral heterogeneities; diverse deformation patterns; crustal and uppermantle structures
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000382595500010
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
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/258780
推荐引用方式 GB/T 7714	Zhang, Heng,Zhao, Junmeng,Zhao, Dapeng,et al. Complex deformation in western Tibet revealed by anisotropic tomography[J]. 中国科学院青藏高原研究所,2016,451.
APA	Zhang, Heng,Zhao, Junmeng,Zhao, Dapeng,Yu, Chunquan,Liu, Hongbing,&Hu, Zhaoguo.(2016).Complex deformation in western Tibet revealed by anisotropic tomography.EARTH AND PLANETARY SCIENCE LETTERS,451.
MLA	Zhang, Heng,et al."Complex deformation in western Tibet revealed by anisotropic tomography".EARTH AND PLANETARY SCIENCE LETTERS 451(2016).