Eyjafjallajökull (Eyjafjallajokull), “Island Mountains’ Glacier”, gets its name from the Vestmannaeyjar (Westman Islands) archipelago in its vicinity. Located to the north of Skógar (Skogar) and to the west of the bigger glacier Mýrdalsjökull (Myrdalsjokull), it is a mountain range formed by many eruptions over the course of thousands of years since the Ice Age. It is cone shaped, the 6th biggest glacier in Iceland (78 sq. km).

The ice-cap of the glacier covers an active stratovolcano (1, 666m in height) which has erupted rather frequently since the last glacial period. The most recent eruption of 2010 has been well documented. Prior to that, there was an eruption in 1821-23, causing a fatal glacier run.

Several steep glacier tongues protrude from the mountain. Two of them, Gígjökull (Gigjokull) and Steinholtsjökull (Steinholtsjokull), drop into two small proglacial lakes filled with floating calved icebergs. The lake in front of Gigjokull is called Jökullón (Jokullon). There is another, smaller, lake in front of Steinholtsjokull. River Steinholtsá (Steinholtsa) flows out of it into Krossá (Krossa). These lakes are formed by encircling walls built up by tons of terminal moraine.

Eruptions and jökulhlaup

The previous major eruption in 1821-23, caused a disastrous glacier run. The crater of the volcano had a diameter of 3-4 km, the glacier covering an extension of about 100 km².

In 1967 there was an enormous landslide onto Steinholtsjokull. On January 15th 1967, at 13:47:55, there was an explosion in the cliff Innstihaus. It can be timed so precisely because the earthquake meters in Kirkjubæjarklaustur picked up the turbulence. When the landslide of about 15 million cubic metres hit the glacier, a huge wave of air, ice, water and huge cliffs started to run from under the glacier and into the lagoon at the foot of the glacier. The wave got as high as 75 metres from the floor of the valley. The cliffs stopped soon afterwards but water and ice touched the floor of the old bridge over Markarfljót River one and a half hours later.

Under the hills of Eyjafjallajokull now stands the mountain ridge Eyjafjöll (Eyjafjoll), but once it was part of the Atlantic coastline. The sea now being at a distance of about 5 km from there, the former coastline left behind sheer cliffs with a multitude of beautiful waterfalls. The best known waterfall is Skógafoss (Skogafoss). When there are sharp winds, the water from the minor falls is sometimes even blown up the mountain. 

The area under Eyjafjoll where now numerous farms stand along the black sand coastal strip was in the past under water, but glacial deposits gradually pushed the coastline into the sea.

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