气候变化领域集成服务门户(CCPortal): Varying deformation patterns in central Tibet revealed by radial anisotropy tomography

CCPortal

DOI	10.1002/2016JB012832
	Varying deformation patterns in central Tibet revealed by radial anisotropy tomography
	Zhang, Heng; Zhao, Dapeng; Yu, Chunquan; Zhao, Junmeng
通讯作者	Zhang, H (通讯作者)
发表日期	2016
ISSN	2169-9313
EISSN	2169-9356
起始页码	3445
结束页码	3461
卷号	121 期号:5
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.
关键词	UPPER-MANTLE BENEATH INDIAN LITHOSPHERE BENEATH SEISMIC ANISOTROPY VELOCITY STRUCTURE SOUTHERN TIBET AZIMUTHAL ANISOTROPY CRUSTAL STRUCTURE UPPERMOST MANTLE COLLISION ZONE NORTHERN
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000381626900017
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
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/258710
推荐引用方式 GB/T 7714	Zhang, Heng,Zhao, Dapeng,Yu, Chunquan,et al. Varying deformation patterns in central Tibet revealed by radial anisotropy tomography[J]. 中国科学院青藏高原研究所,2016,121(5).
APA	Zhang, Heng,Zhao, Dapeng,Yu, Chunquan,&Zhao, Junmeng.(2016).Varying deformation patterns in central Tibet revealed by radial anisotropy tomography.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,121(5).
MLA	Zhang, Heng,et al."Varying deformation patterns in central Tibet revealed by radial anisotropy tomography".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 121.5(2016).