An eruption at Fimmvorduhals, between Eyjafjallajokull and Myrdalsjokull, started a week ago, just before midnight March 20th, 2010.
For latest science-related news about the eruption, check http://www.earthice.hi.is/page/ies_Eyjafjallajokull_eruption
This is a rather small eruption. There is little concern right now, but if the fissure were to widen there are glaciers on either side, and a large flood, jökulhlaup, might follow. Also, the eruption would be more explosive because water would enter the fissure.
Eyjafjallajokull’s neighbor, the mighty volcano Katla, has a history (although a short one) of following it’s neighbor closely. If that were to happen, that would most likely be an eruption of much greater concern. Katla is overlaid by Mýrdalsjökull 500 – 700 m thick over the caldera !
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