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《Chinese Journal of Geophysics》 2011-12
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Crustal structure of shear waves and its tectonic significance in the mid-northern continental margin of the South China Sea

WEI Xiao-Dong~(1,2,4),ZHAO Ming-Hui~(1*),RUAN Ai-Guo~2,QIU Xue-Lin~1, HAO Tian-Yao~3,WU Zhen-Li~2,AO Wei~(1,4),XIONG Hou~(1,4) 1 Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Chinese Academy of Sciences, Guangzhou 510301,China 2 Second Institute of Oceanography,State Oceanic Administration,Hangzhou 310012,China 3 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 4 Graduate University of Chinese Academy of Sciences,Beijing 100049,China  
The joint exploration of P-wave and S-wave can obtain amount of information on lithology and geophysical properties,which effectively improve the composition constraint of the deep crustal structure.Based on the optimum P-wave model,the shear waves recorded on the radial components of profile OBS2006-3 have been modeled by 2-D ray-tracing.The S-wave velocities in sedimentary layer 1 and sedimentary layer 2 are of 0.7~0.9 km/s and 1.6~1.7 km/s, respectively.The V_p/V_s ratios in these sediments vary from 2.64~3.16 to 2.41.The relatively high V_p/V_s ratios are probably related to unconsolidated sediments.In the Mesozoic sedimentary layer,the S-wave velocity increases gradually from 2.6 km/s at the top to 3.0 km/s at the bottom,and the V_p/V_s ratio is of 1.71~1.80.The V_p/V_s ratio of 1.74~1.82 in the crust is considered to be the continental crust.The S-wave velocity and V_p/V_s are 4.0~4.2 km/s and 1.73~1.78 of the High Velocity Layer(HVL) in the lower crust,which suggest that the HVL has a mafic composition that may originate from underplating of the igneous rocks after the cessation of the seafloor spreading.
【Fund】: 国家重点基础研究发展计划(973计划)(2007CB411701);; 国家自然科学基金项目(40876035 41074058 40776025 91028002)资助
【CateGory Index】: P736.1
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