1. College of Marine Science and Technology, China Univ. of Geosciences, Wuhan 430074, PR China; Hubei Subsurface Multi-Scale Imaging Key Laboratory, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, PR China (corresponding author).
2. Professor, College of Marine Science and Technology, China Univ. of Geosciences, Wuhan 430074, PR China.
3. Professor, School of Geodesy and Geomatics, Key Laboratory of Geospace Environment and Geodesy, Wuhan Univ., Wuhan 430079, PR China.