1. School of Geological Engineering and Geomatics, Chang’an University, Weiyang District, Xi’an 710000, China
2. College of Mining, Liaoning Technical University, Zhonghua Road 47, Fuxin 123000, China
3. Shaanxi Hydrogeology Engineering Geology and Environment Geology Survey Center, Xi’an 710068, China
4. School of Earth and Space Sciences, Peking University, Beijing 100871, China