1. Lanzhou Institute of Seismology, CEA Gansu Earthquake Agency, China Earthquake Administration, Lanzhou 730000, China
2. State Key laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
3. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China Gansu Earthquake Agency, China Earthquake Administration, Lanzhou 730000, China