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《Chinese Journal of Geophysics》 2018-03
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Crustal structure beneath the Taiyuan Basin and adjacent areas revealed by double-difference tomography

WANG ChangZai;WU JianPing;YANG Ting;WANG WeiLai;FAN LiPing;FANG LiHua;Institute of Geophysics,China Earthquake Administration;  
The Shanxi rift system is located at the junction of the Ordos and North China blocks,where some historical major earthquakes are documented.Especially many earthquakes greater than M6 have occurred in the middle of this tectonic zone.This study aimed to reveal the velocity structures around the center and the northern part of the Linfen and Taiyuan basins and the center and the southern part of the Xinding basin,analyze the formation and evolution of these basins and discuss the seismogenic environment in this region.Using travel times of 7455 local earthquakes recorded by 30 temporary stations and 50 permanent stations,we obtained 3-D seismic velocity structures and precise earthquake locations of the Taiyuan basin and adjacent areas using the double-difference tomography method.The tomography results show that the upper and middle crust of the Xinding and Taiyuan basins has low velocity anomalies,which are separated by high velocity anomalies in the Shilingguan uplift.The deep structures of the Taiyuanbasin,Linfen basin and Lingshi uplift are more complex than other regions,likely associated with the complicated evolution processes of these two basins.The velocity profile crossing the Xinding basin indicates an obvious low-velocity zone in the middle crust.Most of the earthquakes occurred above the low-velocity zone.The profile crossing the north part of the Taiyuan basin shows intensive seismicity in 20~25 km depth range and delineates the Jiaocheng fault as listric shape.The profile crossing the central part of the Taiyuan basin shows that the depth of the sedimentray layer decreases from west to east.The profile crossing the Linfen basin reveals that the Fendong fault dips to the east and the dipping angle decreases with depth.
【Fund】: 国家自然科学基金(41704064 41774067);; 中国地震局地球物理研究所基本科研业务专项(DQJB14C08)联合资助
【CateGory Index】: P315.7
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【Citations】
Chinese Journal Full-text Database 10 Hits
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【Co-citations】
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