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Iceland 'Gateway to Hell' Volcano to Erupt Again, Experts Say

Volcano in Iceland

Last year, a volcano near Eyjafjoell, Iceland, caused the world's biggest airspace shutdown since World War II. (AP Photo/Ragnar Axelsson)

One of Iceland's most feared volcanoes, Hekla, looks ready to erupt, with measurement instruments showing likely magma movement, an Icelandic geophysicist said Wednesday.

The volcano is close to the ash-spewing Eyjafjoell, which last year caused the world's biggest airspace shut down since World War II, affecting more than 100,000 flights and eight million passengers.

The Iceland Civil Protection Authority said it was closely monitoring the situation.

"The movements around Hekla have been unusual in the last two to three days," University of Iceland expert Pall Einarsson said.

While this might not necessarily mean an immediate blast, "the volcano is ready to erupt," he stressed.

"The mountain has been slowly expanding in the last few years because of magma buildup," he explained.

The volcano, dubbed by Icelanders in the Middle Ages as the "Gateway to Hell," is one of Iceland's most active, having erupted some 20 times over the past millennium, most recently on Feb. 26, 2000.

It measures 4,891-feet (1,491-meters) and is located about 70 miles (110 kilometers) east of Reykjavik, not far from Eyjafjoell.

The news comes just over a month after this year's violent eruption at the Grimsvotn volcano, in the southeast of the country.

That eruption subsided after less than a week, having spit out far more ash than Eyjafjoell, but due to more favorable winds for Europe caused far less air traffic disruption.

Both of Iceland's latest eruptions provided warning signs several hours before, but Hekla is known for having a very short fuse.

"Hekla never gives you much of a warning," Einarsson said, pointing out that in 2000, it began rumbling an hour and a half before the outbreak of magma, which "was actually an unusually long warning. In 1970 we only got 25 minutes notice."

Rongvaldur Olafsson, a project manager at the Icelandic Civil Protection Authority, said no immediate safety precautions were being taken but, "We will watch the mountain and developments very closely."