Response of the ionosphere to the Baltic Sea earthquake of 21 September 2004 |
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| Authors: | Andrzej Krankowski Irina E Zakharenkova Irk I Shagimuratov |
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| Institution: | (1) Institute of Geodesy, University of Warmia and Mazury, ul. Oczapowskiego1, 10-957 Olsztyn, Poland;(2) Immanuel Kant State University of Russia, Nevskogo 14, 236041 Kaliningrad, Russia;(3) WD IZMIRAN, Prospekt Pabedy 41, 236017 Kaliningrad, Russia |
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| Abstract: | GPS observations of the European permanent network were used to identify seismo-ionospheric precursors of Baltic Sea earthquake
of 21 September 2004. It is a very rare event for this region of Europe (magnitude of about 5.0). This value is the threshold
for the occurrence of seismic effects in the ionosphere. In total electron content (TEC) data over the region of the earthquake,
a specific ionospheric anomaly appeared one day before the earthquake was detected. The ionospheric variability had a positive
sign with an enhancement of about 4–5 TECU (1 TECU = 1016 electrons/m2) relative to the non-disturbed state of the ionosphere. The anomaly had a duration of 4–5 hours in the day time. The special
size of this anomaly was about 1000 km. The characteristic parameters of the anomaly show that it can be associated with ionospheric
precursors of an earthquake. |
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| Keywords: | ionosphere TEC earthquakes seismo-ionospheric anomalies |
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