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nd while Eyjafjallajökull is a threat, it’s nothing compared to Katla, a larger and more dangerous volcano. In the past 1,100 years, every time Eyjafjallajökull has erupted, Katla has soon followed suit. “The volcanoes appear to be linked in some way, but it’s not quite clear how,” Dr. Williams-Jones said. “We don’t really know what’s down there.”