1. College of Oceanography and Space Informatics, China University of Petroleum , Qingdao 266580, PR China
2. Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, and College of Marine Geosciences, Ocean University of China , Qingdao 266100, PR China
3. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology , Qingdao 266237, PR China
4. Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences , Sanya 572000, PR China