Author Topic: volcanos iceland  (Read 958 times)

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Offline zeker

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volcanos iceland
« on: May 12, 2014, 03:03:38 PM »
Red alert: Iceland’s Hekla primed for destruction The 2010 eruption of Eyjafjallajökull triggered transport chaos across Europe, but Iceland’s volcanoes can do far worse, as the world discovered in 1783   Lava flow in Iceland: if one of that country’s 35 active volcanoes were to erupt on the scale Laki did in 1783, some 142,000 people across Europe would perish. Photograph: Getty ImagesLava flow in Iceland: if one of that country’s 35 active volcanoes were to erupt on the scale Laki did in 1783, some 142,000 people across Europe would perish. Photograph: Getty ImagesAlexandra Witze, Jeff KanipeThu, May 8, 2014, 01:00First published:  Thu, May 8, 2014, 01:00
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One of Iceland’s most active and most famous volcanoes may be close to erupting. Volcanologists are keeping a watchful eye on Hekla, a mountain in south-central Iceland where magma is building up underground.
There is now more molten rock below Hekla than there was before it last erupted, in 2000, says Freysteinn Sigmundsson, a volcanologist at the University of Iceland. That suggests Hekla is primed to go off in the near future.
The good news is that researchers from the Icelandic Meteorological Office and the University of Iceland are listening to the mountain’s heartbeat. Hekla is one of the featured volcanoes in the Futurevolc project, a 3½-year, pan-European effort to beef up monitoring at Iceland’s riskiest volcanoes. The landscape around Hekla is peppered with the latest instruments to measure earthquakes, ground deformation, and other changes that could signal an impending eruption. If the volcano twitches, scientists know about it.
The bad news is that Hekla is just one of about 35 active volcanoes across Iceland. Until the spring of 2010, hardly anyone worried about a mountain called Eyjafjallajökull. It had been slumbering quietly since 1823. Then in April 2010, molten rock suddenly shot upward and ploughed into the glacier that caps the volcano. Hot rock and frozen water reacted explosively, and huge plumes of volcanic ash billowed into the sky. Wind and weather patterns were just right to carry the ash south and east towards Europe, where aviation officials had to close airspace for days.
Eyjafjallajökull triggered a level of travel chaos that Europe had never seen before. But Iceland’s volcanoes can do far worse. For centuries they have spread ash and toxic gases across Iceland and beyond. Peat bogs in Northern Ireland, for instance, record layer after layer of ash from Icelandic eruptions dating back millenniums.

Deadliest eruption
One Whitsunday morning in June 1783, the ground ripped open near Iceland’s southern coast. This particular eruption, of a volcanic fissure known as Lakagígar or simply Laki, was to become the deadliest in Iceland’s history. Along with enough lava to bury Manhattan 250m deep, it spewed huge amounts of toxic gases. Over the course of eight months Laki belched an estimated 122 million tons of sulphur dioxide into the air, making it one of the biggest atmospheric pollution events in centuries.
Just as happened with Eyjafjallajökull’s ash four years ago, the choking fog from Laki travelled south and east. The haze descended across Britain and Ireland, Scandinavia and much of the rest of Europe, where it lingered visibly for months. Plants withered in the volcanic poison. People breathing the fumes complained of stinging sensations in their lungs – then they, too, began to die. Census officials in England, France and elsewhere chronicled death after death that they could not explain. “The summer of . . . 1783 was an amazing and portentous one, and full of horrible phenomena,” wrote the naturalist Gilbert White.
The winter that followed was horrible in its own way. Unknown to anyone at the time, Laki’s sulphurous particles were reflecting sunlight back into space, acting as a giant cooling umbrella over much of Europe. The continent cooled, and temperatures plunged to record lows. The old, the sick and the vulnerable succumbed to a second wave of killing from Laki.
When the spring thaw began, ice-choked rivers began breaching their banks. In eastern Ireland, the rivers Dodder and Avoca flooded, carrying away farmers’ homes and property. The scene was repeated across Europe. Farther afield, Laki’s cooling particles disrupted weather patterns across the northern hemisphere, shutting down the African monsoon and triggering famine in Egypt.
of all the things I,ve lost.. I miss my mind, the most