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As JimBob stated, it's the volcano under the ice that erupted. The whole of Iceland is volcanic- even if it is far enough north to be covered with glaciers.Iceland sits astride the volcanic rift zone that runs the length of the Atlantic ocean. This is a divergent margin- meaning that the tectonic plates are pulling away from each other and the Atlantic is slowly growing larger. The rift zone is where the plates actually pull apart, easily allowing volcanic material to reach the surface. On top of that, Iceland also sits on a "hotspot"- the lavas that erupt in Iceland probably come from deep in the mantle.There have been 2 very large Icelandic eruptions in the past ~1000 years, Eldgjá around 935-940 AD and Laki in the 1780's. Laki, which released large amounts of sulfur dioxide, may be partly to blame for the intensity of the Little Ice Age.
Part of Iceland is on the North American Plate, and part is on the Eurasian Plate.The good news about these types of volcanoes is that they don't tend to explode since they are basaltic- however, they can expel large volumes of gasses and ash.
[the eruption] Laki in the 1780's, which released large amounts of sulfur dioxide, may be partly to blame for the intensity of the Little Ice Age.
Wasn't it following the creation of ash during the Tunguska Event that the UK had an 18 month winter with Londoners skating on the frozen Thames?
BassRemember that not all of Iceland is erupting- only one small vent at present. So the flood danger is only to those people who live downstream of the glacier where the vent is erupting and melting the ice. Talked with a friend at Cascade Volcano Observatory today who said the eruption is not abating, rather growing more forceful. I'm afraid this could impact Europe for quite some time, depending on wind directions.
I doubt it would go that far. Tambora was the largest volcanic eruption in recorded history. The ejecta volume from the eruption is estimated at 160 cubic kilometers of material The current eruption in Iceland is of a relatively small volcano - Nothing like the Tambora eruption.
... bone marrow which as far as I can work out is useless after 72 hours.
Harvested bone marrow can be combined with a preservative and frozen to keep the stem cells alive until they are needed. This technique is known as cryopreservation. Stem cells can be cryopreserved for many years.