Lava River - Eyjafjallajökull Eruption

Mýrdalsjökull glacier is Eyjafjallajökull glacier's bigger brother, both in terms of size of the glacier and also in terms of capability and size of its eruptions. Under the bigger brother lies the powerful and dangerous Katla caldera. It erupts every 60-80 years. Now it been more than 90 years since its last eruption so it will likely go off in near future, especially when it smaller brother wakes up which historically has always triggered the bigger brother to show its dominance.

Image credit: http://www.flickr.com/photos/orvaratli/4461539560/