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Katla (Icelandic pronunciation: [ˈkʰahtla] (About this sound listen)) is a large volcano in southern Iceland. It is very active; twenty eruptions have been documented between 930 and 1918, at intervals of 13–95 years. It has not erupted violently for 99 years, although there may have been small eruptions that did not break the ice cover, including ones in 1955, 1999, and 2011.
Prior eruptions have had a Volcanic Explosivity Index (VEI) of between 4 and 6 on a scale of 0 to 8. In comparison, the Eyjafjallajökull 2010 eruption had a VEI-4. The bigger VEI-6 eruptions are comparable to Mount Pinatubo's 1991 eruption.
Though Katla was quiet today there were earthquakes in Bárðarbunga volcano in Vatnajökull glacier. The biggest was 3,1 on the Richter scale.
Óskarsdóttir says the earthquakes in Katla and in Bárðarbunga are not connected, as the two volcanoes are far apart and don’t draw on the same source.