STM Journals Peer-reviewed research from Consortium e-Learning Network

Journal of Remote Sensing & GIS

Analysis of anomalous Ionospheric Total Electron Content variation for earthquakes in South East Asian region with International GNSS Service Network

  1. Anjan Debnath

Abstract

A study has been undertaken to find ionospheric total electron content anomaly around various earthquake days occurring in a period from January, 2016, to March, 2017, in the South East Asian region. Large Magnitude shallow earthquakes are considered only. For the study Vertical Total Electron Content (hereafter abbreviated as VTEC) data for various dual frequency GPS receivers maintained by the IGS network was collected with the help of IONOLAB-TEC software tool. Then these VTEC trends were analyzed to find anomalous TEC variation around earthquake days. For the analysis only those IGS stations that fall within Dobrovolsky Radius (hereafter abbreviated as D.R.) of each earthquake or are closest have been chosen. The analysis included geo magnetically quiet days only to take out all non-seismic effects in the ionosphere. The analysis shows VTEC irregularity spanning few days around many earthquake events. In many cases it was found that VTEC peaks are anomalously high before few days of earthquake and they slowly fall back to normal values. Continuous VTEC values have been plotted to analyze trend of VTEC variation.Keywords: VTEC, Dobrovolsky Radius, IONOLAB-TEC, IGS NetworkCite this ArticleAnjan Debnath. Analysis of anomalous Ionospheric Total Electron Content variation for earthquakes in South East Asian region with International GNSS Service Network. Journal of Remote Sensing & GIS. 2018; 9(3): 37–45p.
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