The Bardarbunga volcano is covered by glacier several hundred metres thick and has been experiencing dozens of earthquakes - some more than four on the Richter scale - for days. Icelandic authorities called in experts, including Professor Chris Bean and Dr Aoife Braiden from the European Union-funded FutureVolc research group, to closer monitor how the volcano is interacting with the glacier it is threatening to melt.
Prof Bean said: "If it breaks the surface of the earth under the glacier it will melt the water and that will interact with the magma at depth, and the system will become explosive. It will pulverise the glacier and rock into fine particles, and that is where the danger of the ash cloud comes.''
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