Viewing post #667320 by rannveig

You are viewing a single post made by rannveig in the thread called A volcanic eruption in Grímsvötn.
May 24, 2011 11:16 AM CST
Name: Rannveig
Hafnarfjörður, Iceland
Well, it hasn't stopped but the worst is definately over. This eruption is behaving the same way as other eruptions in Grímsvötn, powerful at first but dvindling fast. They've usually only lasted 4-5 days and let's hope the same goes for this one. It is an unusually big eruption; it released more ash into the atmosphere in the first 24-hours than the entire Eyjafjallajökull eruption that lasted almost a month.

I'm not sure Katla could be classified as a super-volcano ..... this current eruption in Grímsvötn is similar to an average Katla eruption. The difference is that an eruption in Katla also causes a huge flood that poses danger to towns and farms south of the glacier. Although both volcanos are located beneath a glacier, the glacier is constantly melting in Grímsvötn forming the lake that empties out regularly. Therefore the icecap isn't very thick and there isn't that much meltwater to cause a flood. Especially now since the lake emptied out in a flood in November. Also because of the regular floods there aren't any farms or towns in their wake. Katla however has erupted once or twice every century and there aren't any floods between eruptions. The icecap is VERY thick so the flood is huge and it moves fast. So there's very short time to evacuate, only about an hour maybe. That is the biggest concern with Katla. The odds are that she will erupt in the next 10 years, it's impossible to predict when. She's closely monitored and an increase in seizmic activity has been recorded since last year's Eyjafjallajökull eruption although an eruption there isn't imminent.

The ash has reached Norway: An even thicker cloud of ash than the one over Reykjavík on Sunday night.

It's brighter today south of the glacier. It's been very windy since yesterday afternoon, and judging from footage from Kirkjubæjarklaustur today all the ash seems to have blown away. Considering how thick it was yesterday it seems pretty amazing. This was yesterday afternoon: ; this today:


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