Key Laboratory of Submarine Geosciences;
Ministry of Natural Resources/Second Institute of Oceanography;
Ministry of Natural Resources;
Hangzhou 310012;
China;
Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai);
Zhuhai 519080;
China;
School of Oceanography;
Shanghai Jiao Tong University;
Shanghai 200240;
China;
P-wave; velocity; structure; ocean; bottom; seismometer; Kyushu-Palau; Ridge; magmatism; thicken; oceanic; crust;