Katla ) is a large volcano in southern Iceland. It is very active; twenty eruptions have been documented between 930 and 1918, at intervals of 20–90 years. It has not erupted violently for 101 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 of between 4 and 6 on a scale of 0 to 8. In comparison, the Eyjafjallajökull 2010 eruption had a VEI of 4. Bigger VEI-5 eruptions are comparable to Mount Pinatubo's 1991 eruption, while significantly rarer VEI-6 eruptions would be comparable to Krakatoa's 1883 eruption.
Source: Wikipedia.org
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