Keflavík airport in Iceland has been closed due to the eruption of  Grímsvötn volcano. Ashfall surrounding the volcano has already reached a  thickness of half a centimetre. This is the largest eruption at  Grímsvotn volcano in 100 years and larger than the   one in  Eyjafjallajökull last year. It is similar to the eruption of   1873 at  Grímsvotn. A large glacial flood (Jokulhlaup) is not expected. This  morning ash emissions reached a height of 15 to 18 kilometres, which is  ten times more powerful than   the last eruption in Grímsvötn in 2004.
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