کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10694425 1020064 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ionospheric anomalies of local earthquakes detected by GPS TEC measurements using data from Tashkent and Kitab stations
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
پیش نمایش صفحه اول مقاله
Ionospheric anomalies of local earthquakes detected by GPS TEC measurements using data from Tashkent and Kitab stations
چکیده انگلیسی
This paper reports the ionospheric anomalies observed during strong local earthquakes (M⩾5.0) which occurred mostly in and around Uzbekistan in seismically active zones, during years 2006 to 2009 within approximately 1000 km distance from the observing GPS stations located in Tashkent and Kitab, Uzbekistan. The solar and geomagnetic conditions were quiet during occurrence of the selected strong earthquakes. We produce Total Electron Content (TEC) time series over both sites and apply them to detect anomalous TEC signals preceding or accompanying the local earthquakes. The results show anomalous increase or decrease of TEC before or during the earthquakes. In general the anomalies occurred 1-7 days before the earthquakes as ionospheric electromagnetic precursors. To identify the anomalous values of TEC we calculated differential TEC (dTEC). dTEC is obtained by subtracting monthly averaged diurnal vTEC from the values of observed vTEC at each epoch. This procedure removes normal diurnal variations of vTEC. The present results are in good agreement with the previous observations on ionospheric earthquake precursors reported by various researchers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Space Research - Volume 52, Issue 6, 15 September 2013, Pages 1146-1154
نویسندگان
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