1. Institute of Geophysics, China Earthquake Administration, 5 South Minzu University Road, Haidian District, Beijing 100081, China, chinakkmm@gmail.com
2. China Earthquake Networks Center, 5 Nanheng Road, Sanlihe Street, Xicheng District, Beijing 100045, China, liujie@seis.ac.cn
3. Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Yard 1, Hua Yan Li, Chaoyang District, Beijing 100029, China