Associated Press in Vik
guardian.co.uk,

Brooding above rugged moss-covered hills on Iceland's southern edge, Katla is bigger than nearby Eyjafjallajökull, which spewed ash all over Europe for several weeks and cost airlines $2bn (£1.2bn).
Named after an evil troll, Katla has a larger magma chamber than Eyjafjallajokul's, according to local scientist Páll Einarsson. Its last major eruption, in 1918, continued for more than a month, turning day into night, starving crops of sunlight and killing off livestock. The eruption melted some of the ice sheet covering Katla, flooding surrounding farmlands.
Now, clusters of small earthquakes are being detected around Katla, which means an eruption could be imminent, seismologists say. The earthquakes have been growing in strength, too. After a long period of magnitude-3 tremors, a magnitude-4 quake was detected last week.
"It is definitely showing signs of restlessness," said Einarsson, a professor of geophysics at the University of Iceland...
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