Analysis of anomalous ionospheric total electron content variation for earthquakes in South East Asian region with IGS network

Abstract

A study to find ionospheric Total Electron Content (TEC) anomaly around various earthquake days that occurred during January, 2016 to March, 2017 in the South East Asian region has been undertaken. Large magnitude shallow earthquakes have only been considered. In the study, VTEC data from IGS network has been analyzed with the help of IONOLABTEC software tool. The analysis has been done based on IGS stations that fall within Dobrovolsky Radius of each earthquake. The analysis has included geo magnetically quiet days only to take out all non-seismic effects in the ionosphere. The analysis has shown TEC irregularity few days around almost all earthquake events.