1. School of Earth Sciences and Engineering, Hohai University, Nanjing 211000, China
2. Anhui Jianzhu University, Hefei 230601, China
3. Department of Physics & Department of Earth Sciences, University of Toronto, Toronto M5S 1A7, Canada
4. Changshu Seismic Station, Jiangsu Earthquake Administration, Changshu 215500, China
5. Earthquake Administration of Jiangsu Province, Nanjing 210014, China