Only three previous eruptions of Eyjafjallajökull are known in the last 1100 years!!
In fact Eyjafjallajökull did not erupt for the last 190 years.
The most recent eruption began in December 1821 and lasted intermittently for more than a year.
Eyjafjallajökull is considered by scientists a precursor of Katla's activity, Katla is the more dangerous one, larger and more powerful.
The neighbouring volcano Katla in fact punctually erupted then on 26 June 1823, around 19 months later.
These two volcanoes are historically linked and an eruption of Eyjafjallajökull normally triggers Katla.
Scientists know the danger, but there is very little we can do about powerful volcanoes.
An eruption of Katla in between now and 2012 is therefore likely
.
What Katla could do:
"Iceland's Laki volcano erupted in 1783, freeing gases that turned into smog. The smog floated across the Jet Stream, changing weather patterns. Many died from gas poisoning in the British Isles. Crop production fell in western Europe. Famine spread. "
Is it going to be Earth's revenge against humans?
Hopefully all the above is just fiction.
