Upper-Crustal Anisotropy of the Conjugate Strike-Slip Fault Zone in Central Tibet Analyzed Using Local Earthquakes and Shear-Wave Splitting
文献类型：期刊论文
| 作者 | Wu, Chenglong3 ; Tian, Xiaobo1,3; Xu, Tao1,3; Liang, Xiaofeng3; Chen, Yun3; Zhu, Gaohua4; Badal, Jose5; Bai, Zhiming3; Yu, Guiping2,3; Teng, Jiwen3
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| 刊名 | BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
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| 出版日期 | 2019-10-01 |
| 卷号 | 109期号:5页码:1968-1984 |
| ISSN号 | 0037-1106 |
| DOI | 10.1785/0120180333 |
| 英文摘要 | Remarkable V-shaped conjugate strike-slip faults extend along the Bangong-Nujiang suture in central Tibet. Motions of these faults are considered to accommodate ongoing east-west extension and north-south contraction. Fabrics within the fault zone that are anisotropic to seismic waves can provide clues as to the unusual scale and style of lithospheric deformation. With the goal of determining the upper-crustal anisotropy pattern in central Tibet, we measured shear-wave splitting parameters (fast wave polarization direction and delay time) using waveforms generated by 194 local earthquakes recorded by 49 stations of the SANDWICH network. Stations located in eastern and western zones of the study area show anisotropy directions that agree well with the maximum horizontal compressive stress direction. The fast polarization directions at stations near active strike-slip faults generally run parallel to the strikes of these faults. Pervasive inactive thrust faults caused by Cretaceous-Tertiary shortening in central Tibet also clearly correlate with the anisotropy detected at nearby stations. These results demonstrate that both local structures and stress contribute to upper-crustal anisotropy in the region. Combining the new results with previous SKS-wave splitting results and other seismic evidence, we propose that deformation in the upper crust is mechanically decoupled from that in the upper mantle, due to eastward middle-lower crustal flow. This crustal flow causes basal shearing required for the formation of conjugate strike-slip faults in central Tibet. |
| WOS关键词 | SAN-ANDREAS FAULT ; EAST-WEST EXTENSION ; SEISMIC ANISOTROPY ; SOUTHERN TIBET ; UPPER-MANTLE ; VELOCITY ANISOTROPY ; SYSTEMATIC ANALYSIS ; SHALLOW CRUST ; CENTRAL-ASIA ; BENEATH |
| 资助项目 | National Key Research and Development Program of China[2016YFC0600301] ; National Key Research and Development Program of China[2016YFC0600302] ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0701] ; National Natural Science Foundation of China[41804058] ; National Natural Science Foundation of China[41674064] ; National Natural Science Foundation of China[41704042] ; National Natural Science Foundation of China[41574082] ; National Natural Science Foundation of China[41522401] ; National Natural Science Foundation of China[41474068] ; National Natural Science Foundation of China[41574056] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | SEISMOLOGICAL SOC AMER |
| WOS记录号 | WOS:000487813300027 |
| 资助机构 | National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/93708]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 通讯作者 | Wu, Chenglong |
| 作者单位 | 1.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 4.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Sha Tin, Hong Kong 999077, Peoples R China 5.Univ Zaragoza, Phys Earth Sci B, Pedro Cerbuna 12, E-50009 Zaragoza, Spain |
| 推荐引用方式 GB/T 7714 | Wu, Chenglong,Tian, Xiaobo,Xu, Tao,et al. Upper-Crustal Anisotropy of the Conjugate Strike-Slip Fault Zone in Central Tibet Analyzed Using Local Earthquakes and Shear-Wave Splitting[J]. BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,2019,109(5):1968-1984. |
| APA | Wu, Chenglong.,Tian, Xiaobo.,Xu, Tao.,Liang, Xiaofeng.,Chen, Yun.,...&Teng, Jiwen.(2019).Upper-Crustal Anisotropy of the Conjugate Strike-Slip Fault Zone in Central Tibet Analyzed Using Local Earthquakes and Shear-Wave Splitting.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,109(5),1968-1984. |
| MLA | Wu, Chenglong,et al."Upper-Crustal Anisotropy of the Conjugate Strike-Slip Fault Zone in Central Tibet Analyzed Using Local Earthquakes and Shear-Wave Splitting".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 109.5(2019):1968-1984. |
入库方式： OAI收割
来源：地质与地球物理研究所
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