1. Ph.D. Candidate, School of Geological Engineering and Geomatics, Chang’an Univ., Xi’an 710064, China.
2. Professor, School of Geological Engineering and Geomatics, Chang’an Univ., Xi’an 710064, China; Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Chang’an Univ., Xi’an 710054, China; Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing 210049, China (corresponding author).