1. 1School of Earth and Space Science, Peking University, Beijing, China
2. 2Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany
3. 3Institute of Earthquake Forecasting, China Earthquake Administration, Beijing, China
4. 4China Earthquake Networks Center, Beijing, China
5. 5Sichuan Earthquake Administration, Chengdu, China