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Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results
Zhou, Beibei1,2,3; Liang, Xiaofeng1,3; Lin, Guoqing4; Tian, Xiaobo1,5; Zhu, Gaohua6; Mechie, James7; Teng, Jiwen1,3
2019-05-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Volume124Issue:5Pages:4654-4672
AbstractA series of conjugate strike-slip faults is the most prominent geologic feature in central Tibet and is considered to accommodate east-west extension and coeval north-south contraction. The development mechanism of the conjugate strike-slip fault system is under debate because of unclear crustal physical properties and compositional variations. P and S wave arrivals from 414 local earthquakes recorded by the temporary Seismic Array Integrated Detection for a Window of Indian Continental Head array and the permanent China National Seismic Network were used for the velocity tomography, with additional P and S wave arrivals from 12 shots of the International Deep Profiling of Tibet and the Himalaya III reflection/refraction profile. The local earthquakes were simultaneously relocated with the updated velocity models. We also inverted for a three-dimensional upper crustal Qp model with the same earthquake data set. The Vp structure near the surface shows that low-Vp anomalies generally correspond to sedimentary basins and high-Vp anomalies are related to exhumed metamorphic blocks in the study area. Relatively low Vp/Vs ratios in the upper crust indicate widely distributed quartz-rich rocks. The low-Vp zone from 0- to 10-km depth (resolving depth limit) is spatially correlated with the Bangong-Nujiang suture, possibly reflecting the compositional difference along the ophiolitic melange belt accompanied by twin volcanic arcs from a double-sided subduction. This interpretation is supported by relatively heterogeneous Qp values. This low-velocity zone also implies relatively uniform stress and continuous deformation in the upper crust of central Tibet. The relatively weak materials in at least the upper crust would result in strain concentration and help the development of the conjugate strike-slip fault system along the Bangong-Nujiang suture.
Keywordcentral Tibet seismic tomography attenuation upper crust conjugate strike-slip fault SANDWICH
DOI10.1029/2018JB016653
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS
WOS KeywordBANGONG-NUJIANG SUTURE ; EAST-WEST EXTENSION ; SOUTHERN TIBET ; QIANGTANG BASIN ; HEAT-FLOW ; PLATEAU ; DEFORMATION ; CONSTRAINTS ; ASIA ; LITHOSPHERE
Language英语
Funding ProjectStrategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB18000000] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB03010700] ; National Natural Science Foundation of China[41574056] ; National Natural Science Foundation of China[41404051] ; Youth Innovation Promotion Association, CAS[2017093]
Funding OrganizationStrategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; Youth Innovation Promotion Association, CAS
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000477721500022
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/92921
Collection岩石圈演化国家重点实验室
Corresponding AuthorLiang, Xiaofeng
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Earth Sci, Beijing, Peoples R China
4.Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Dept Marine Geosci, 4600 Rickenbacker Causeway, Miami, FL 33149 USA
5.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
6.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Hong Kong, Peoples R China
7.Deutsch GeoForschungsZentrum GFZ, Sect Geophys Deep Sounding, Potsdam, Germany
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhou, Beibei,Liang, Xiaofeng,Lin, Guoqing,et al. Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(5):4654-4672.
APA Zhou, Beibei.,Liang, Xiaofeng.,Lin, Guoqing.,Tian, Xiaobo.,Zhu, Gaohua.,...&Teng, Jiwen.(2019).Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(5),4654-4672.
MLA Zhou, Beibei,et al."Upper Crustal Weak Zone in Central Tibet: An Implication From Three-Dimensional Seismic Velocity and Attenuation Tomography Results".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.5(2019):4654-4672.
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