泸定M_S6.8地震前后的电离层TEC扰动分析

The TEC Perturbation Analysis of Ionosphere Before and After the LudingM_S6.8 Earthquake

为了分析泸定M_S6.8地震期间的电离层TEC异常与地震之间的相关性,基于2022年8月6日—2022年9月8日GFZ全球电离层格网数据,选取4个特征点并使用滑动四分位距法,检测2022年9月5日泸定M_S6.8地震孕震区上空的VTEC异常。4个特征点的VTEC在8月26日、8月30日、9月4日、9月5日和9月8日均出现异常扰动,排除空间环境活动的干扰后,8月26日的负异常和8月30日的正异常与本次地震相关,且VTEC异常集中出现在世界时间UT04:00-12:00,呈现先增大后减小特征。检测结果表明,地震期间的电离层TEC异常与地震之间具有较强的相关性,可为地震的预测分析提供参考。

In order to analyze the correlation between the ionospheric TEC anomalies and the Luding M_S6.8 earthquake,based on the GFZ global ionosphere map from August 6th to September 8th,2022,we selected four key points and em⁃ployed the sliding quartile range method to detect the VTEC anomalies over the epicentral region of the Luding M_S6.8 earthquake on September 5th,2022.The VTEC at the four selected key points exhibited anomalous disturbances on Au⁃gust 26th,August 30th,September 4th,September 5th,and September 8th.After excluding the interference of spatial environmental activities,the negative anomaly on August 26th and the positive anomaly on August 30th were found to be correlated with this earthquake,Furthermore,the VTEC anomalies were concentrated between UT04:00 and 12:00,ex⁃hibiting a characteristic of initial increase followed by decrease.The detection results demonstrate a strong correlation be⁃tween the ionospheric TEC anomalies during the earthquake and the seismic event itself,and can provide valuable refer⁃ence for earthquake prediction and analysis.