基于GNSS数据的地震电离层扰动探测分析

Analysis of Seismic Ionospheric Disturbance Detection Based on GNSS data

针对传统方法无法解决地震-电离层扰动探测参考背景值较低的问题,借助中国地震局全球卫星导航系统(GNSS)数据产品服务平台提供中国区域电离层格网数据(GIM),基于滑动四分位距法对2020-06-26新疆和田地区于田县(35.73°N,82.33°E)发生Mw6.4级地震进行地震-电离层扰动探测。实验结果表明在震前3 d和震前7 d 4个格网探测格网点均探测到地震-电离层扰动现象,且仅探测格网点(36°N,82°E)在震前12 d探测出地震-电离层扰动现象,排除空间环境因素干扰后,判定此次电离层扰动现象可能是新疆和田地区于田县地震引起的。

To solve the problem that the reference background value of seismic ionospheric disturbance detection is too low to be solved by traditional methods,China regional ionospheric grid data(GIM)was provided by the Global Satellite Navigation System(GNSS)data product service platform of China Seismological Administration.Based on the sliding quartile distance method,the Mw6.4 earthquake occurred in Yutian County(35.73°N,82.33°E)in Hotan region,Xinjiang on June 26,2020 was studied with the sliding quartile method on ionospheric disturbance detection.The experiment results show that the seismic ionospheric disturbance phenomenon was detected in all the four grid detection grid stores 3days before the earthquake and 7 days before the earthquake,and only in the detection grid point(36°N,82°E)the seismic ionospheric disturbance phenomenon was detected 12 days before the earthquake.After excluding the interference of space environmental factors,we determined that the ionospheric disturbance phenomenon may be caused by the Yutian earthquake in Hetian area,Xinjiang.