1. Chinese Academy of Sciences, Institute of Acoustics, State Key Laboratory of Acoustics, Beijing, China; Chinese Academy of Sciences, Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources Research, Beijing, China; and University of Cambridge, Bullard Laboratories, Department of Earth Sciences, Cambridge, UK. (corresponding author)
2. Chinese Academy of Sciences, Institute of Geology and Geophysics, Key Laboratory of Petroleum Resources Research, Beijing, China.
3. Chinese Academy of Sciences, Institute of Acoustics, State Key Laboratory of Acoustics, Beijing, China.
4. University of Cambridge, Bullard Laboratories, Department of Earth Sciences, Cambridge, UK.