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Vol. 9 (2006 year), No. 3
Zakharenkova I.E., Shagimuratov I.I., Lagovsky A.F., Krankovsky A.
Variations of total electron content of the ionosphere during the Kaliningrad earthquake of 21 September, 2004
The GPS-derived total electron content (TEC) measurements have been used to detect ionospheric precursors for the unique Baltic Sea (near Kaliningrad, Russia) 21 September 2004 earthquake (M = 4.9). The GPS measurements of more than 100 stations of the EUREF network the TEC maps over Europe have been produced with the 15-minute interval. The specific ionospheric anomaly has been found on the base of the maps near the epicenter a day before the earthquake. The anomaly has been observed as a patch of the increase ionization about 4-5 hours in day time and has spatial size equal to ~ 1000 km. Taking into account the quiet geomagnetic conditions and characteristic parameters of the anomaly it has been associated with ionospheric precursors of the earthquake.
(in Russian, стр.6, fig. 7, tables. 0, ref 18, Adobe PDF, Adobe PDF 666 Kb)
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)
Vol. 12 (2009 year), No. 2
Namgaladze A.A., Zolotov O.V., Zakharenkova I.E., Shagimuratov I.I., Martynenko O.V.
Ionospheric total electron content variations observed before earthquakes: Possible physical mechanism and modeling
Some experiments have been carried out by phase association and infrasonic sources location using the Apatity infrasound array and Finnish-Swedish acoustic network. Several events from the area of Plesetsk spaceport have been detected and located. The analysis of variation of backazimuth estimations has been done basing on signals from repeating military explosion in Northern Finland. Estimations of the location accuracy for the explosions have been obtained. It has been confirmed that cause-effect relation exists between facts of presence or absence of infrasonic wave first arrivals and weather conditions.
(in English, стр.8, fig. 6, tables. 0, ref 29, Adobe PDF, Adobe PDF 0 Kb)