利用张衡一号卫星电场数据研究吉林松原、河北唐山M_(S)5.1地震前后空间电场时空演化特征  

Spatio-Temporal Evolution of Electric Field Pre-and Post-Earthquakes Based on the CSES Satellite:M_(S)5.1 Earthquakes in Songyuan,Jilin Province and Tangshan,Hebei Province

作　　者：杨牧萍 钱庚 张学民[3] 孔祥瑞[1] 申旭辉 张萌[1] 翟丽娜[1] 金艳铭 YANG Muping;QIAN Geng;ZHANG Xuemin;KONG Xiangrui;SHEN Xuhui;ZHANG Meng;ZHAI Lina;JIN Yanming(Liaoning Earthquake Agency,44 North-Huanghe Street,Shenyang 110031,China;Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China;Institute of Earthquake Forecasting,CEA,63 Fuxing Road,Beijing 100036,China;National Institute of Natural Hazards,MEM,1 Anningzhuang Road,Beijing 100085,China)

机构地区：[1]辽宁省地震局,沈阳市110031 [2]中国地震局地震研究所,武汉市430071 [3]中国地震局地震预测研究所,北京市100036 [4]应急管理部国家自然灾害防治研究院,北京市100085

出　　处：《大地测量与地球动力学》2022年第11期1161-1165,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震科技星火计划(XH21013Y);中国地震局震情跟踪定向工作任务(2020010416,2021010204)。

摘　　要：利用我国第一颗电磁监测试验卫星张衡一号电场探测仪(EFD)载荷记录到的ULF/ELF频段电场功率谱密度(PSD)数据,限制Dst≥-30 nT和K_(p)<3排除空间磁环境扰动后,分4个频段对2020年唐山古冶M_(S)5.1地震和2019年吉林松原M_(S)5.1地震前后空间电场时空演化特征进行研究。结果发现,2020年唐山古冶M_(S)5.1地震4个频段扰动幅度均显示出震前先抬升至最高点超过2倍均方差,而后在下降过程中发震,震后恢复的规律,且第2频段异常尤为明显;4个频段扰动幅度时间序列特征相似,且震前均超过2倍均方差。2019年吉林松原M_(S)5.1地震不同频段的扰动幅度时间序列特征不同,仅有第2频段超过2倍均方差。2次地震均在第2频段(371~879 Hz)出现震前异常扰动,认为该频段是地震异常提取的优势频段。To carry out statistical analysis of the spatio-temporal evolution of the electric field during the M_(S)5.1 earthquakes in Songyuan,Jilin province and Tangshan,Hebei province,we use four frequency bands of the power spectrum density(PSD)data in the ULF/ELF frequency band recorded by the electric field detector(EFD)of the first seismo-electromagnetic satellite-CSES in China with geomagnetic active indexes Dst≥-30nT and K _(p)<3.The analysis shows that the perturbation amplitudes in the four frequency bands all increased to the high perturbation stage,which reached more than 2 times the standard deviation before the earthquake,and the earthquake occurred during the descent stage during the M_(S)5.1 earthquake in Tangshan,Hebei province.Then,the perturbation amplitudes recovered,and it was obviously abnormal in the second frequency band.The perturbation amplitudes in the four frequency bands are very similar,and they all reached more than 2 times the standard deviation before the earthquake.The perturbation amplitudes in the four frequency bands are different during the M_(S)5.1 earthquake in Songyuan,Jilin province.There,only the perturbation amplitude in the second frequency band reached more than 2 times the standard deviation.The perturbation amplitudes of the both earthquakes were obviously abnormal in the second frequency band(371-879 Hz)before both earthquakes,which is considered to be the dominant frequency band for seismic anomaly.

关 键 词：张衡一号 电场探测仪 功率谱密度 时空演化 地震异常 

分 类 号：P315[天文地球—地震学]