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Formation of Rifts in Central Tibet: Insight From P Wave Radial Anisotropy
Zhang, H (Zhang, Heng)1; Li, YE (Li, Yunyue Elita)2; Zhao, DP (Zhao, Dapeng)3; Zhao, JM (Zhao, Junmeng)1,4; Liu, HB (Liu, Hongbing)1,4
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
2018-12-01
Volume123Issue:10Pages:8827-8841
DOI10.1029/2018JB015801
Abstract

The strikes of rifts in western Tibet show NNW-SSE trending, whereas the rifts in eastern Tibet strike in the NNE-SSW direction. The difference in the rift strike orientation suggests that the formation mechanisms of these rifts are different in southern Tibet, which can be most reliably inferred from seismic structure beneath these rifts. In this work we study 3-D P wave velocity structure and radial anisotropy using a large number of travel time data recorded by the ANTILOPE and Hi-CLIMB portable seismic arrays deployed in central Tibet. Our results show that to the west of the Pumuqu Xianza rift, a low-velocity zone with a positive radial anisotropy exists beneath the Lopu Kangri rift (similar to 85 degrees E), which may reflect melt-filled cracks. A high-velocity zone with a negative radial anisotropy is revealed beneath the Pumuqu Xianza rift (similar to 88 degrees E), which reflects lithospheric downwelling. The different upper mantle structures may result in the patterns of rift strike orientation in central Tibet.

Subject Area地质学
WOS IDWOS:000451086200029
Language英语
Indexed BySCIE
KeywordLithosphere Beneath Seismic Anisotropy Upper-mantle Azimuthal Anisotropy Central-asia Southern Deformation Extension Tomography Subduction
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN2169-9313
Department大陆碰撞与高原隆升重点实验室
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8526
Collection图书馆
Corresponding AuthorZhang, H (Zhang, Heng)
Affiliation1.Chinese Acad Sci, Inst Tibetan Plateau Res, Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China;
2.Natl Univ Singapore, Dept Civil & Environm Engn, Singapore, Singapore;
3.Tohoku Univ, Dept Geophys, Sendai, Miyagi, Japan;
4.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, H ,Li, YE ,Zhao, DP ,et al. Formation of Rifts in Central Tibet: Insight From P Wave Radial Anisotropy[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2018,123(10):8827-8841.
APA Zhang, H ,Li, YE ,Zhao, DP ,Zhao, JM ,&Liu, HB .(2018).Formation of Rifts in Central Tibet: Insight From P Wave Radial Anisotropy.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,123(10),8827-8841.
MLA Zhang, H ,et al."Formation of Rifts in Central Tibet: Insight From P Wave Radial Anisotropy".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 123.10(2018):8827-8841.
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