1. Institute of Geophysics and Geodynamics, School of Earth Sciences and Engineering; Nanjing University; Nanjing China
2. Earthquake Administration of Jiangsu Province; Nanjing China USA
3. Department of Geology; University of Illinois at Urbana-Champaign; Urbana Illinois USA
4. School of Geodesy and Geomatics; Wuhan University; Hubei China