Changes in Bárdarbunga Caldera

VolcanoCafé

Image of the Holuhraun eruption taken by the Volcanocafé Productions Film expedition to Bárdarbunga. This image is from the upcoming film by Eggert Norddahl, Bergsveinn Norddahl and Nick Small. Produced by Volcanocafé. Image of the Holuhraun eruption taken by the Volcanocafé Productions Film expedition to Bárdarbunga. This image is from the upcoming film by Eggert Norddahl, Bergsveinn Norddahl and Nick Small. Produced by Volcanocafé.

During a scientific over flight a marked and unexpected drop was noticed in the caldera floor of the Bárdarbunga Central Volcano. The drop was 15 meters, and is as such the largest deformation of a caldera in Iceland. It is interpreted as the result of magma leaving the magmatic reservoir under the caldera floor.

If this number is valid for all of the 11 by 7km caldera it equals to a volume of drained magma of 808 million cubic meters, or just shy of a cubic kilometer. This does not take into account magma that has come into the system during this episode.

Now, where has all of this magma gone? Well between one quarter and one third…

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