1. Geological Survey of Japan, AIST, Higashi 1‐1‐1, Tsukuba, Ibaraki 305‐8567, Japan, xinglin-lei@aist.go.jpzhiwei-wang@ies.ac.cn
2. Also at State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, A1#, Hua Yan Li, Chaoyang District, Beijing 100029, China.
3. Earthquake Monitoring Centre, Sichuan Earthquake Administration, Renming‐nan Road 3‐29, Chengdu 610041, China, sujr0816@163.com