Velocity and azimuthal anisotropy structures beneath the Dianzhong Block and its vicinity, SE Tibetan Plateau, revealed by eikonal equation-based traveltime tomography
文献类型：期刊论文
| 作者 | Liu, Shaolin2,3,4; Chang, Kai4; Yang, Dinghui3; Xu, Xiwei4; Wang, Wenshuai1; Yang, Shuxin4; Li, Mengyang4 |
| 刊名 | TECTONOPHYSICS
 |
| 出版日期 | 2022-09-20 |
| 卷号 | 839页码:16 |
| ISSN号 | 0040-1951 |
| 关键词 | P -wave velocity Azimuthal anisotropy Dianzhong Block Seismic tomography Xiaojiang Fault |
| DOI | 10.1016/j.tecto.2022.229525 |
| 英文摘要 | The Dianzhong Block (DZB) located on the southeastern margin of the Tibetan Plateau is an important tectonic zone characterized by the intense flow of crustal material. Although it is widely accepted that materials originating from the Tibetan Plateau migrate southeastward in the DZB and its vicinity, the flow mechanism and subsurface structures remain controversial. Here, we image the subsurface velocity and azimuthal anisotropy structures beneath the DZB and its surroundings by using eikonal equation-based tomography to study the crustal flow and deformation mechanisms. In this study, we collect high-quality seismic data from 290 broadband seismic stations and manually pick a total of 31,981 first arrivals. Our tomographic results display prominent velocity anomalies and complex azimuthal anisotropy patterns. In the upper crust, our results reveal predominant high-velocity anomalies, which are related to the Emeishan large igneous province (ELIP) and the stable Simao Block. We find strong low-velocity anomalies beneath the DZB in the middle???lower crust. The low-velocity anomalies extend southward from the Xiaojinhe Fault (XJHF) to the Red River Fault (RRF) and then rotate southeastward to the east of the Xiaojiang Fault (XJF). In addition, the inverted fast velocity directions generally follow the strike of the low-velocity anomalies. Based on these findings, we consider the existence of middle???lower crustal flow inside the DZB. Three distinct features of azimuthal anisotropy in the middle-upper crust are found around the XJF reflecting complex deformation, which may indicate different factors controlling the deformation of the XJF from the north to the south. In the lower crust and uppermost mantle, the azimuthal anisotropy beneath the RRF is relatively complex, exhibiting two patterns: one perpendicular and another parallel to the fault. |
| WOS关键词 | LOWER CRUSTAL FLOW ; P-WAVE VELOCITY ; UPPER-MANTLE ; SEISMIC ANISOTROPY ; FAULT SYSTEM ; EARTHQUAKE ; YUNNAN ; DEFORMATION ; TECTONICS ; CHINA |
| 资助项目 | National Institute of Natural Hazards, Ministry of Emergency Management of China[ZDJ2019-18] ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution[SKL-K202101] ; National Natural Science Foundation of China[U1839206] ; National Natural Science Foundation of China[42174111] ; National Natural Science Foundation of China[42064004] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000841140700003 |
| 资助机构 | National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; 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 Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; 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 Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; 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 Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; National Institute of Natural Hazards, Ministry of Emergency Management of China ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; Open Fund Project of the State Key Laboratory of Lithospheric Evolution ; 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/132A11/108438]  |
| 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 | Liu, Shaolin |
| 作者单位 | 1.Ningxia Univ, Sch Math & Stat, Yinchuan 750021, Ningxia, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 3.Tsinghua Univ, Dept Math Sci, Beijing 100084, Peoples R China 4.Minist Emergency Management China, Natl Inst Nat Hazards, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Shaolin,Chang, Kai,Yang, Dinghui,et al. Velocity and azimuthal anisotropy structures beneath the Dianzhong Block and its vicinity, SE Tibetan Plateau, revealed by eikonal equation-based traveltime tomography[J]. TECTONOPHYSICS,2022,839:16. |
| APA | Liu, Shaolin.,Chang, Kai.,Yang, Dinghui.,Xu, Xiwei.,Wang, Wenshuai.,...&Li, Mengyang.(2022).Velocity and azimuthal anisotropy structures beneath the Dianzhong Block and its vicinity, SE Tibetan Plateau, revealed by eikonal equation-based traveltime tomography.TECTONOPHYSICS,839,16. |
| MLA | Liu, Shaolin,et al."Velocity and azimuthal anisotropy structures beneath the Dianzhong Block and its vicinity, SE Tibetan Plateau, revealed by eikonal equation-based traveltime tomography".TECTONOPHYSICS 839(2022):16. |
入库方式： OAI收割
来源：地质与地球物理研究所
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