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Vol. 9 (2006 year), No. 3

Sergeenko N.P., Zakharenkova I.E., Shagimuratov I.I., Sazanov A.V., Rogova M.V.
The analysis of ionospheric macroscale transient irregularities associated with earthquakes (according to GPS observations)

GPS observations of IGS (International Geodynamic Service) network have been used to detect the ionospheric irregularities associated with earthquake precursors. Analyses of GPS-derived TEC data have confirmed a hypothesis about occurrence in the vicinity of strong earthquakes (M>5) epicenters macroscale positive ionospheric inhomogeneities. They arise for 10-15 hours before earthquakes and move horizontally approximately on an arc of a major circle transiting through the epicenter with a transonic speed. The verification of this hypothesis has been performed for two cases – the isolated event of August 17, 1999 and the second one – of May 6, 1999, when 9 spatial and time spaced shocks took place. For these nine earthquakes (M>5) the corresponding group of ionosphere irregularities has been identified. The received results have shown the opportunity of using GPS technique to detect, on world-wide scale, ionospheric irregularities associated with ionospheric precursors and consequently to use for the short-term forecast of strong earthquakes.

(in Russian, стр.8, fig. 6, tables. 1, ref 22, Adobe PDF, Adobe PDF 1700 Kb)