1. Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China. E-mail: renhx@sustech.edu.cn
2. Department of Geophysics, School of Geodesy and Geomatics, Wuhan University, Wuhan, Hubei 430079, China
3. Beijing Geoscience Center, Schlumberger, Beijing 100096, China
4. School of Earth and Space Sciences, Peking University, Beijing 100871, China