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Katla Volcano

With a square area of over 595 kilometers, a caldera of 10 kilometers in diameter, and a peak reaching 1,512 meters, Katla Volcano is one of the largest in Iceland. It is also one of the most actives, having erupted at least 20 times since the year 1100. Katla is a particular volcano in the sense that it is partially hidden beneath the Mýrdalsjökull glacier, with some areas being covered by up to 700 meters of ice. This causes important flooding and mudslides during eruptions, with discharges estimated to 400,000 cubic meters per second (a flow comparable to the planet’s most powerful rivers); the last eruption even added some 5 kilometers to Iceland’s southern coast. Katla is very active; in fact, it has been showing signs of unrest since 1999, which have consistently intensified after the infamous 2010 Eyjafjallajökull eruptions. Geologists have genuine concerns that Katla might erupt in the near future and cause devastating damage on Route 1, Iceland’s main road.

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