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《Chinese Journal of Geophysics》 2016-09
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Fine crustal structure of the Lushan area derived from seismic reflection profiling

FENG Yang-Yang;YU Chang-Qing;FAN Zhu-Guo;SONG Li-Rong;LIANG Shan-Shan;HE Jun-Jie;MEI Zhong-Feng;Faculty of Land Resource Engineering,Kunming University of Science and Technology;Institute of Geology,Chinese Academy of Geological Sciences;Chifeng seismic station,Seismological Bureau of Inner Mongolia Autonomous Region;College of Earth science and Engineering,Shandong University of Science and Technology;China earthquakes networks center;Tuha Division,BGP Inc.,CNPC;  
A deep seismic reflection profiling was collected to probe the fine crustal structure of the Lushan area,Sichuan Province.The purpose is to reveal the relationship between the shallow and deep structures,and the geometry and kinetics of the blind active faults using the seismicprofiling and surface geology.The results show that the crust of the study area is characterized by a distinct structure of upper crust with thickness about 15 km.The nature of the faults is inferred to be thrusting in the region due to the pushing of the crustal material of the Tibetan plateau into the southeast part of the rigid Sichuan basin.The Shuangshi-Dachuan fault stretches from the surface to the deep crust at a low angle,and is dominated by thrusting in a form of imbricate structure with small-scale faults nearby.Whereas the Guangyuan-Dayi fault is of a positive flower structure with a listric shape,consisting of six branches.Its movement is dominated by thrusting with gentle horizontal slip.We also speculated there are two faults,one is with steep dip and another is with gentle dip,2km to near the seismogenic fault of the Lushan earthquake.According to the forms of the three faults,we suggested that they convergence at the depth of 18 km and extend downward,and were activated during the occurrence of the Lushan earthquake.The results reveal the relationship between the subsurface active faults and the deep crustal structure,which would shed a light on the further research of the deep structure,the relationship between shallow and deep structures,and the fault activity of the whole Longmenshan fault zone.
【Fund】: 国家科技专项《汶川地震断裂带科学钻探项目》(WFSD);; 中国地质调查局项目《龙门山构造带三维地质填图》(1212011220265)联合资助
【CateGory Index】: P315.2
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