1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu, China;
2. School of Geology Engineering and Geomatics, Chang’an University, Xi'an, ShaanXi, China;
3. Institute of Geo-hazards Mitigation, Chang’an University, Xi'an, ShaanXi, China;
4. Key Laboratory of Western Mineral Resources and Geological Engineering Ministry of Education, Chang’an University, Xi'an, ShaanXi, China;
5. North China University of Water Resources and Electric Power, Zhengzhou, Henan, China