Research on short-impending ELF electromagnetic anomaly based on DEMETER satellite before the Wenchuan M_(s)8.0 earthquake  

基于DEMETER卫星数据研究汶川8.0级地震前ELF电磁短临异常

作　　者：Zhang Jian-Guo Zhao Chang-Hong Zhang Lei Zhang Shuang-Feng Shen Xuan-Ye Yang Xiao-Dong 张建国;赵长红;张磊;张双凤;申炫烨;杨晓冬(河北省地震局,中国石家庄050021;中国科学技术大学,中国合肥230026)

机构地区：[1]Hebei Earthquake Agency,Shi Jiazhuang Hebei 050021,China [2]University of Science and Technology of China,Hefei Anhui 230026,China

出　　处：《Applied Geophysics》2025年第1期209-219,236,共12页应用地球物理(英文版)

基　　金：National Natural Science Foundation of China(No.41274079,No.42304080);Seismic Safety and Health Monitoring of Major Construction Projects-Bridge and Reservoir Seismic Monitoring(No.DZ2024083000001);State Key Research and Development Plan under Grant(No.2018YFE0208300,No.2018YFC0603500).

摘　　要：This study analyzed data from the DEMETER satellite,collected 10 days before the Wenchuan M_(s)8.0 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.基于法国DEMETER卫星记录的空间电磁场三分量观测数据,对2008年5月12日汶川M_(s)8.0地震前连续10天的轨道数据进行时一频功率谱分析计算,发现在地震前第6天存在低于截止频率的窄带电磁辐射扰动及在地震前3天电场Ez分量出现的显著异常,而在地震前10天的连续轨道数据分析中,在非震区上空并未发现类似的异常现象,这可能反映了地震前各参量的变化与地震孕育及电离层之间的耦合关系。

关 键 词：Wenchuan earthquake ELF band electromagnetic radiation power spectrum abnormity DEMETER satellite 

分 类 号：P31[天文地球—固体地球物理学]