1. Institute of Disaster Prevention , Sanhe City , 065201 , People’s Republic of China
2. Hebei Key Laboratory of Earthquake Dynamics , Sanhe City , 065201 , People’s Republic of China
3. College of Earth Science and Engineering, Shandong University of Science and Technology , Qingdao 266590 , People’s Republic of China
4. Jilin Exploration Geophysics Institute , Changchun City , 130012 , People’s Republic of China