1. 1 Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
2. 2 Yibin Research Institute, Southwest Jiaotong University, Yibin 644000, China
3. 3 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
4. 4 China Water Resources Beifang Investigation, Design and Research Co. Ltd, Tianjin 300222, China
5. 5 Chongqing Survey Institute, Chongqing 401121, China
6. 6 Tibet Bureau of Geological Exploration, Lhasa, Tibet 850000, China