1. Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin 300072, China
2. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
3. Key Laboratory of Earthquake Geodesy, Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
4. Earthquake Agency of Qinghai Province, Xining 810001, China