Normally I would not post a link to a diary in Kos.  This is the best reporting about the lava moment in the Iceland's fissure volcanic system.  Bárðarbunga the largest of the volcanoes in Iceland could very well erupt.  I copied and pasted the name because of it's spelling.  They now have it at a level 4 out of 5 that makes it something to pay attention too.  It could disrupt air travel and weather.  

This author has written several diaries in the last few days.  He lives in Iceland and all his charts are understandable but in his native language.  So follow his links from his first paragraph and you can follow how this situation as it developed.  Fissure eruptions can be very dangerous because they emit poisonous gas.  It happened in the 18th century when Iceland had an eruption and people died in Scotland and Europe of Fluoride Gas.  The magma movement is happening in a monster of a volcano but right now it is moving horizontally and the measuring that is going on tells the scientist that there is a lot of it with force.  It could settle down and not erupt but they are not taking any chances.