2016年缅甸M7.2地震前中国区域电离层TEC扰动的时空分布

Spatial-temporal Distribution of Ionospheric TEC Perturbations in China Prior to the 2016 Myanmar M7.2 Earthquake

基于GPS TEC数据,以2016年4月13日发生在缅甸的M7.2地震为例,通过限定上、下阈值的扰动提取方法分析了地震电离层效应在中国区域的时空分布。结果显示,该地震前2~4天,中国区域的TEC扰动为地震电离层前兆;其中4月11日(震前2天)电离层扰动受地震的影响最大,扰动范围可达2816 km;同时还发现4月11日异常最明显的区域在震中偏北方向(中国南部),单独提取该区域经度链上的JPL TEC数据,发现异常区域内北驼峰北移的现象,并用静电场理论对异常区域向北偏移的物理机制做了分析解释。

Based on the data of GPS TEC,taking Myanmar M7.2 earthquake on April 13 th,2016 as an example,this paper analyzes the spatial and temporal distribution of seismo-ionospheric anomalies in China by using upper and lower thresholds to extract disturbance.The result shows that for 2 to 4 days before this earthquake,TEC disturbance in China was seismo-ionospheric precursor,especially the ionospheric disturbance on April 11th(two days before earthquake)was most affected by the earthquake,and the disturbance range could reach 2816 km.Meanwhile,on April 11th,the most obvious abnormal area was in the northward direction of the epicenter(Southern China).Through extracting the JPL TEC data on the longitude chain of the most obvious abnormal area,we found that the north EIA had been moved northwards.We t use the theory of electrostatic field to explain the possible physical mechanism of this abnormal phenomenon.