1. State Key Laboratory of Marine Geology, Tongji University, 1239 Siping Road, Shanghai 200092, China
2. Now at Department of Geophysics, Hanoi University of Mining and Geology, 18 Pho Vien Road, Duc Thang, Bac Tu Liem, Hanoi 100000, Vietnam.
3. Department of Ocean Science and Engineering, Southern University of Science and Technology (SUSTech), 1088 Xueyuan Road, Shenzhen 518055, China, tyang@sustc.edu.cn