1. School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2. Wuhan Center, China Geological Survey (Central South China Innovation Center for Geosciences), Wuhan 430205, China
3. Geological Environmental Center of Hubei Province, Wuhan 430034, China
4. Ningxia Survey and Monitor Institute of Land and Resources, Yinchuan 750002, China