地震前后电离层TEC扰动分析

TEC perturbation analysis of ionosphere before and after earthquakes

针对传统的探测手段获取电离层参考背景值精度较低的问题,借助IGS发布的GIM格网数据,利用奇异谱分析提取TEC主成分探测地震前后电离层扰动,使用该方法和滑动四分位距法对2018年1月23日阿拉斯加湾Ms8.2地震进行探测,实验结果表明:两种方法探测结果基本保持一致,在震前3 d、9 d和震后2 d发生电离层TEC扰动现象,震前9 d的扰动现象与地磁活动强烈干扰相关,在排除空间环境干扰因素后,认为震前3 d和震后2 d电离层异常是由地震引发的。

Aiming at the problem of low precision of reference background value obtained by traditional detection methods,with the help of GIM grid data released by IGS,a new method of extracting TEC principal components based on singular spectrum analysis to detect ionospheric disturbances before and after earthquakes is proposed.The method along with sliding quartile distance method is used to detect the Ms8.2 earthquake in the Gulf of Alaska on January 23,2018.The experimental results show that the detection results of the two methods are basically consistent.The ionospheric disturbance occurs three days before,nine days after and two days after the earthquake.The disturbance occurs nine days before the earthquake is related to the strong disturbance of magnetic activity.After excluding the interference factors of space environment,it is considered that the ionospheric anomalies caused by the earthquake are three days before and two days after the earthquake.