Abstract This study analyzed data from the DEMETER satellite, collected 10 days before the Wenchuan Ms8.0 earthquake on May 12, 2008. The time-frequency power spectrum of the data indicated a narrow-band radiative destabilization (below the cut-off frequency) 6 days prior to the earthquake. A significant anomaly in the Ez component was observed 3 days before the event. However, similar phenomena were found over aseismic regions, suggesting a link between ionospheric changes and the earthquake generation process.
Fund: This research was supported by the National Natural Science Foundation of China (No.41274079, No.42304080), and the Seismic Safety and Health Monitoring of Major Construction Projects-Bridge and Reservoir Seismic Monitoring (No. DZ2024083000001), and in part by the State Key Research and Development Plan under Grant (No.2018YFE0208300, No.2018YFC0603500).
About author: Zhang Jianguo is a senior engineer at Hebei Earthquake Agency. He obtained his Ph.D. in geophysics from the University of Science and Technology of China.His main research focuses on earth electromagnetis , extraction of earthquake anomaly, and numerical simulation.
Cite this article:
. Research on short-impending ELF electromagnetic anomaly based on DEMETER satellite before the Wenchuan Ms8.0 earthquake[J]. APPLIED GEOPHYSICS, 2025, 22(1): 209-219.
2025, Vol. 22 
