2016年缅甸M7.2地震前中国区域电离层TEC扰动的时空分布

Based on the data of GPS TEC, taking Myanmar M7.2 earthquake on April 13th, 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 11^th (two days before earthquake) was most affected by the earthquake, and the disturbance range could reach 2816 km. Meanwhile, on April 11^th, 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.