川滇地区电离层垂测站震例数据分析

Analysis of Seismic Data of Ionospheric Vertical Station in Sichuan and Yunnan

基于川滇地区电离层垂测普洱站和乐山站记录数据,对2018年云南墨江MS5.9和2019年四川长宁M S6.0地震震前电离层特征参数f0F2异常数据进行处理分析。结果显示:在云南墨江地震前第3天,普洱站上空出现显著电离层异常扰动现象,特征参数f0F2相对背景阈值的最大异常扰动达64%;在四川长宁地震前第4天,乐山站上空也出现明显电离层异常扰动现象,特征参数f0F2相对背景阈值的最大异常扰动达58%。这些扰动现象很可能属于地震前兆异常。

Based on the data recorded at the Pu er and Leshan stations in Sichuan and Yunnan,this paper mainly analyzed the variation of the ionospheric f0F2 before the Yunnan Mojiang MS5.9 earthquake in 2018 and the Sichuan Changning MS6.0 earthquake in 2019.The results show that on the 3rd day before the Mojiang earthquake in Yunnan,there was a significant anomalous disturbance of the ionosphere over the Pu er station,and the maximum anomalous disturbance of the characteristic parameter f0F2 relative to the background threshold reached 64%;on the 4th day before the Changning earthquake in Sichuan,there is obviously abnormal disturbance of the ionosphere,and the maximum abnormal disturbance of the characteristic parameter f0F2 reaches 58%.These disturbances are likely to be earthquake precursor anomalies.