1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
2. Second Crust Monitoring and Application Center, China Earthquake Administration, Xi’an 710054, China
3. School of Resource and Environmental Science, Wuhan University, Wuhan 430079, China
4. Texas Center for Geographic Information Science, Department of Geography, Texas State University, San Marcos, TX 78666, USA