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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Three-dimensional crustal Vp and Vs structures beneath the southern segment of the Tan-Lu fault revealed by active source and earthquake data

文献类型：期刊论文

作者Zhang, Yunpeng2; Wang, Baoshan1,2,3; Xu, Tao4,5; Yang, Wei2; Wang, Weitao2; Xu, Yihe2; Li, Lu2
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2020-12-01
卷号223期号:3页码:2148-2165
关键词Body waves Airgun source Seismic tomography Crustal structure
ISSN号0956-540X
DOI10.1093/gji/ggaa314
英文摘要The 2400-km-long Tan-Lu fault, the largest deformation zone in eastern China, plays a decisive role in the seismicity, regional tectonics and mineral deposits distributions. However, the velocity structure beneath the Tan-Lu fault, particularly in the southern segment, is poorly imaged due to the lack of local earthquakes. To obtain a high-resolution crustal structure image, we carried out an active source experiment by firing mobile airgun sources along the Yangtze River in the Anhui Province in October 2015. We manually picked 4118 P wave and 1906 S wave first arrival times from the airgun signals. We also collected 28 957 P wave and 26 257 S wave first arrival times from local earthquakes in a larger area. 3-D crustal velocity images beneath the southern segment of the Tan-Lu fault and surrounding areas are studied using traveltime tomography. Compared with the local earthquake data, the active source data provide better constraints on the upper crustal structure, which further refines the resolution of the lower-crust structure. The Vp and Vs crustal structures are consistent with the local geological settings, and earthquakes are primarily clustered near faults and are spatially correlated with low-velocity zones. Strong velocity contrasts are observed across the Tan-Lu fault zone, which is the main factor controlling local anomalies. The high Vp, Vs and Vp/Vs beneath the Qinling-Dabie orogenic belt and the Middle-Lower Yangtze River Metallogenic Belt may relate to Mesozoic lithospheric delamination and asthenospheric upwelling. These results also demonstrate that the mobile large-volume airgun sources are promising tools for 3-D crustal structure surveys.
WOS关键词LOWER YANGTZE-RIVER ; SOURCE SEISMIC EXPERIMENT ; WAVE VELOCITY STRUCTURE ; TANCHENG-LUJIANG FAULT ; METALLOGENIC BELT ; TOMOGRAPHY BENEATH ; CONTINENTAL-CRUST ; SURROUNDING AREAS ; DEEP-STRUCTURE ; OROGENIC BELT
资助项目National Natural Science Foundation of China[41674061] ; National Natural Science Foundation of China[41674058] ; National Natural Science Foundation of China[41790462] ; National Natural Science Foundation of China[41790464] ; Institute of Geophysics, China Earthquake Administration[DQJB17T04]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000605982100045
出版者OXFORD UNIV PRESS
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics, China Earthquake Administration ; Institute of Geophysics, China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics, China Earthquake Administration ; Institute of Geophysics, China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics, China Earthquake Administration ; Institute of Geophysics, China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Institute of Geophysics, China Earthquake Administration ; Institute of Geophysics, China Earthquake Administration
源URL[http://ir.iggcas.ac.cn/handle/132A11/100001]  
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Wang, Baoshan
作者单位1.Univ Sci & Technol China, Mengcheng Natl Geophys Observ, Hefei 230026, Peoples R China
2.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
3.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China
4.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100029, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Yunpeng,Wang, Baoshan,Xu, Tao,et al. Three-dimensional crustal Vp and Vs structures beneath the southern segment of the Tan-Lu fault revealed by active source and earthquake data[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2020,223(3):2148-2165.
APA Zhang, Yunpeng.,Wang, Baoshan.,Xu, Tao.,Yang, Wei.,Wang, Weitao.,...&Li, Lu.(2020).Three-dimensional crustal Vp and Vs structures beneath the southern segment of the Tan-Lu fault revealed by active source and earthquake data.GEOPHYSICAL JOURNAL INTERNATIONAL,223(3),2148-2165.
MLA Zhang, Yunpeng,et al."Three-dimensional crustal Vp and Vs structures beneath the southern segment of the Tan-Lu fault revealed by active source and earthquake data".GEOPHYSICAL JOURNAL INTERNATIONAL 223.3(2020):2148-2165.

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来源：地质与地球物理研究所

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