Key Laboratory of Submarine Geosciences and Prospecting Techniques;
Ministry of Education;
Qingdao 266100;
P. R. China;
College of Marine Geosciences;
Ocean University of China Qingdao 266100;
P R China;
Department Of Ocean Science and Engineering;
Zhejiang University;
Hangzhou 310058;
P. R. China;
Faculty of Science;
Koehi University;
Kochi 780-8520;
Japan;