Institute of Marine Geology and Resources Zhejiang University Zhoushan Zhejiang 316021 China;
Institute of Marine Geology and Resources Zhejiang University Zhoushan Zhejiang 316021 ChinaLaboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology Qingdao 266237 China;
State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China;
South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China;
South China Sea Institute of Oceanology Chinese Academy of Sciences Guangzhou 510301 China;
South China Sea; continental margin; crustal structure; converted S-wave; VP/VS ratio; lithology; serpentinization;