1Laboratory of Seismology and Physics of Earth's Interior, School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, Anhui, China
2Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, Anhui 230026, China
3Nationnal Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China
4Geophysical Exploration Center, China Earthquake Administration, Zhengzhou, 450002, China