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Experts are warning that an eruption could be imminent at an even more powerful Icelandic volcano than the one that paralysed air traffic last year.
Seismologists are nervously watching rumblings beneath Katla which could spew an ash cloud dwarfing the 2010 eruption that cost airlines two billion dollars (£1.27 billion) and drove home how vulnerable modern society is to the whims of nature.
Its last major eruption in 1918 continued more than a month, turning day into night, starving crops of sunlight and killing off some livestock.
The eruption melted some of the ice-sheet covering Katla, flooding surrounding farmlands with a torrent of water that some accounts have said measured as wide as the Amazon.
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 three tremors, a magnitude four quake was detected last week.
"It is definitely showing signs of restlessness," said Mr Einarsson, a professor of geophysics at the University of Iceland.
Teams of seismologists and geologists at the university are tracking the spike in seismic activity and working with disaster officials to prepare communities near Katla like Vik, a small town of some 300 people that is flanked by black sand beaches.
Civil defence authorities have been holding regular meetings with scientists. Disaster officials have also drafted an evacuation plan and set aside temporary housing, but many fear they may have less than an hour to evacuate once the volcano erupts.
Iceland sits on a large volcanic hot spot in the Atlantic's mid-oceanic ridge. Eruptions, common throughout Iceland's history, are often triggered by seismic activity when the Earth's plates move and magma from deep underground pushes its way to the surface.
The longer pressure builds up, the more catastrophic an eruption can be. Records show that
Katla usually has a large eruption twice a century. Since its last eruption was almost exactly 93 years ago, it is long overdue for another, seismologists say.
Katla is a much larger Icelandic volcano system located approximately 17 miles (27 km) to the east Eyjafjallajokull. Geoscientists are wary not only for the damage an eruption could cause Iceland, but also the international implications that could follow, including global temperature change.
The far-larger glacier situated on top of the volcano has potential to devastate the local community's highways, bridges and farmland with flooding as the magma pushes through to the surface and melts the glacial ice above it. This glacier outburst flooding, or jokulhlaup, is notorious throughout Iceland's history for causing destruction.