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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)