基金Acknowledgements We thank the reviewers and editors for their useful and careful comments. We thank the seismological bureaus of Gansu, Sichuan, Yunnan, Jiangsu, Shandong, Anhui, Hebei, Shanxi, and other provinces for providing observation data on geoelectric fields and the China Earthquake Network Center for providing the seismic catalogs. We also thank Fan Ying Ying for her help in the manuscript preparation. This study was supported by two special tasks from the Monitoring and Forecasting Department of China Earthquake Administration （ 16A28ZX 116, 16A28ZX l 17）.
基金supported by the National Key Basic Research Program of China （973 program, No. 2014CB845700） the Strategic Priority Research Program of the Chinese Academy of Sciences （Grant No. XDB01020300） the National Natural Science Foundation of China （Grant Nos. 11390371, 11222326 and 11233004） Acknowledgements This study is supported by the National Key Basic Research Program of China （973 program, No. 2014CB845700）, the Strategic Priority Research Program of the Chinese Academy of Sciences （Grant No. XDB01020300） and the National Natural Science Foundation of China （Grant Nos. 11390371, 11222326 and 11233004）. The Guo Shou Jing Telescope （the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST） is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission. LAMOST is operated and managed by National Astronomical Observatories, Chinese Academy of Sciences. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The SDSS-III web site is http：//www.sdss3.org/. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, University of Florida, the French Participation Group, the German Participation Group, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University