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Preliminary investigation of the September 21, 2004, earthquakes of Kaliningrad Region, Russia

Wiejacz P.

Acta Geophysica Polonica

2004

Vol. 52, nr 4

425-441

On September 21, 2004, the northeastern area of Poland has experienced two notable earthquakes of magnitudes 5.0 and 5.3. The earthquakes have originated across the state border in the nearby Kaliningrad Region, Russia. Although the damages were minor and no casualties have been reported in Poland, the appearance of such earthquakes in an area otherwise considered non-seismic and totally safe has caused much concern on behalf of relief services and population in general. The earthquakes will naturally cause reassessment of the seismic hazard for this area and will be subject to scientific analysis. This paper summarizes those investigations of the events that result from everyday seismological observatory routine, providing information on location and magnitude of the events. The source mechanism is also being discussed. The results evidence that the Kaliningrad is a seismically active area, even though the earthquakes happen relatively seldom and do not reach devastating size.