The Ice Queen
Bárðarbunga is a subglacial stratovolcano beneath the Vatnajökull ice cap, rising to ~2,009 m. It has a caldera about 70 km² in area and is part of Iceland's largest volcanic system at ~200 km long. It produced the largest lava eruption in Iceland in over 230 years with the 2014-2015 Holuhraun event.
The 2014-2015 Holuhraun eruption created an 85 km² lava field in Iceland's remote highlands -- the largest lava flow in the country since the catastrophic Laki eruption of 1783.
Unlike most Icelandic eruptions, magma from Bardarbunga traveled 45 km laterally through a subterranean dyke before erupting on the barren highland surface north of the glacier.
The Holuhraun eruption lasted 6 months (August 2014 - February 2015) and created a lava field larger than Manhattan. It was one of the most closely monitored eruptions in history.
Unlike most Icelandic eruptions, Holuhraun occurred on the surface (not under ice), making it safely accessible for scientific study. It became the most monitored effusive eruption in history, with continuous measurements of lava flow, gas emissions, and ground deformation.
Bárðarbunga is one of Iceland's most closely monitored volcanic systems due to its potential for large-scale eruptions.
Earthquake swarms in January 2025 included ~130 earthquakes up to magnitude 5.1, suggesting magma accumulation under the caldera. Scientists monitor the system closely for signs of potential future eruptions.
The Holuhraun eruption lasted 181 days, pumping out 1.6 cubic kilometers of lava and massive quantities of sulfur dioxide gas. At its peak, SO2 emissions reached 60,000 tonnes per day -- causing air quality warnings across Iceland.
Because the eruption occurred on the surface rather than under ice, scientists had unprecedented access for research, making it one of the best-documented eruptions in history.
The Bardarbunga caldera lies buried beneath hundreds of meters of glacial ice. During the 2014-2015 eruption, the caldera floor subsided by 65 meters as magma drained laterally toward the Holuhraun fissure.
The Holuhraun lava field is located in Iceland's remote highlands, north of Vatnajökull glacier.
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