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学科主题: 地球科学::地球物理学
题名: Varying deformation patterns in central Tibet revealed by radial anisotropy tomography
作者: Zhang, H (Zhang, Heng)1, 2; Zhao, DP (Zhao, Dapeng)3; Yu, CQ (Yu, Chunquan)2; Zhao, JM (Zhao, Junmeng)1
通讯作者: Zhang, H
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
发表日期: 2016
DOI: 10.1002/2016JB012832
卷: 121, 期:5, 页:3445-3461
收录类别: SCI
合作性质: 国际
文章类型: Article
英文摘要: P 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.
语种: 英语
WOS记录号: WOS:000381626900017
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7701
Appears in Collections:图书馆_期刊论文

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作者单位: 1.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:
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.
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