The Kaliningrad earthquake on September 21, 2004 was a rare but very significant example of the potential of moderate earthquakes in the East European Platform. The following three shocks were instrumentally recorded with sequential magnitudes mb: 4.1, 4.9, and 3.0 (Geophysical Service of Russia); 4.4 and 5.0 (EMSC); and 4.8 and 4.9 (NEIC).
