1. Graduate student, School of Earth Sciences and Engineering, Nanjing University, Nanjing, P. R. China
2. Professor, School of Earth Sciences and Engineering, Nanjing University, Nanjing, P. R. China; Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing University, Nanjing, P. R. China (corresponding author: )
3. Professor, Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing University, Nanjing, P. R. China
4. Graduate student, School of Earth Sciences and Engineering, Nanjing University, Nanjing, China