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Correction of OBS Position and Recent Advances of 3DSeismic Exploration in the Central Sub-Basin of South China Sea

ZHANG Li 1,3,ZHAO Ming-hui 1*,WANG Jian 1,3,HE En-yuan 1,3,AO Wei 2,QIU Xue-lin 1,XU Hui-long 1,WEI Xiao-dong 1,3,ZHANG Jia-zheng 1,3 1.CAS Key Laboratory of Marginal Sea Geology,South China Sea Institute of Oceanology,Guangzhou 510301,China 2.Dept.of Science and Technology,Shenzhen Branch of CNOOC,Guanzhou 510240,China 3.University of Chinese Academy of Science,Beijing 100049,China  
A three-dimensional(3D)Ocean Bottom Seismometer(OBS)seismic exploration is implemented for the first time in the central sub-basin of South China Sea(SCS).The velocity distribution in 3Dhigh spatial variability is significant to understand the history of expansion and evolution of SCS.However,high-precision 3Ddata processing determines the resolution and accuracy for the further seismic structure,where OBS position is one of the key parameters in seismic structural study.We use the travel time data of direct water waves to simulate the process of OBS landing on seafloor employing the least squares method and Monte Carlo method.Finally the corrections of OBS positions have been achieved for a total of 39OBSs in the central subbasin of SCS experiment.Meanwhile the accuracy of Monte Carlo method for relocation has been discussed.A few clear and reliable P-wave seismic phases,such as Pg,PmP and Pn,were discovered in the OBS seismic record sections,which come from deep crust or upper mantle beneath the Zhenbei-Huangyan volcanic chains.These abundant seismic phases provide a strong data foundation to the further modeling of 3Dtomography for the central sub-basin of SCS.
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