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Varying deformation patterns in central Tibet revealed by radial anisotropy tomography
Zhang, H (Zhang, Heng)1,2; Zhao, DP (Zhao, Dapeng)3; Yu, CQ (Yu, Chunquan)2; Zhao, JM (Zhao, Junmeng)1; Zhang, H
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
2016
Volume121Issue:5Pages:3445-3461
DOI10.1002/2016JB012832
AbstractP wave radial anisotropy tomography of the upper mantle beneath the central Tibetan plateau is derived using a large number of traveltime data of teleseismic events. Our results show a prominent high-velocity (high-V) zone which is separated by a low-velocity (low-V) anomaly beneath the Himalayan block, extending to similar to 33 degrees N, and a low-V zone down to similar to 300 km depth beneath the northern Qiangtang block. The upper mantle beneath northern Qiangtang exhibits a significant positive radial anisotropy (i.e., horizontal V-p > vertical V-p), implying lateral material flow rather than material upwelling in the upper mantle. In the central part of the study region, a prominent high-V zone exists at depths of 150 to 300 km and exhibits a negative radial anisotropy (i.e., horizontal V-p > vertical V-p), reflecting the subducting Indian lithospheric mantle. Variations of shear wave splitting in this region revealed by previous studies may be attributed to the low-V layer above the Indian lithospheric mantle. A high-V zone with a positive radial anisotropy is located beneath the southern Lhasa block, which is interpreted to be the northward underthrusting Indian lithospheric mantle. Multilayer radial anisotropy is detected beneath southern Tibet, which may reflect a complex deformation pattern there.
Subject Area地球物理学
WOS IDWOS:000381626900017
Language英语
Indexed BySCI
KeywordUpper-mantle Beneath Indian Lithosphere Beneath Seismic Anisotropy Southern Tibet Surrounding Regions Velocity Structure Collision Zone Azimuthal Anisotropy Crustal Structure Uppermost Mantle
Cooperation Status国际
Department碰撞与隆升
SubtypeArticle
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Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/7701
Collection图书馆
Corresponding AuthorZhang, H
Affiliation1.Chinese Acad Sci, Lab Continental Collis & Plateau Uplift, Inst Tibetan Plateau Res, Beijing, Peoples R China
2.MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
3.Tohoku Univ, Dept Geophys, Sendai, Miyagi, Japan
Recommended Citation
GB/T 7714
Zhang, H ,Zhao, DP ,Yu, CQ ,et al. Varying deformation patterns in central Tibet revealed by radial anisotropy tomography[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2016,121(5):3445-3461.
APA Zhang, H ,Zhao, DP ,Yu, CQ ,Zhao, JM ,&Zhang, H.(2016).Varying deformation patterns in central Tibet revealed by radial anisotropy tomography.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,121(5),3445-3461.
MLA Zhang, H ,et al."Varying deformation patterns in central Tibet revealed by radial anisotropy tomography".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 121.5(2016):3445-3461.
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