A series of earthquakes struck Banja Luka on October 26 and 27, 1969. They began with an unusually strong tremor on the night of October 26 at 02:55. Foreshocks commenced several hours later and small tremors continued until 08:53. The mainshock occurred at 16:36. The hypocenter was 20 kilometres (12 mi) below the city with a moment magnitude of 6.1 and a maximum Mercalli intensity of VIII (Severe). The earthquake was followed by a 6.5-6.6 magnitude a day later. It was categorized as a doublet earthquake.
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