Global Volcanism Program | Image GVP-05992
Askja's largest historical eruption occurred in 1875. Subsidence of the caldera continued for 40-50 years after the eruption and resulted in the formation of Askja's inner caldera, now filled by Öskjuvatn lake, seen here from the SE. The flat, lava-covered floor of the main caldera can be seen beyond the lake, encircled by the caldera rim.
Photo by Michael Ryan, 1984 (U.S. Geological Survey).
This image is made available under the Creative Commons BY-NC-ND 4.0 license terms.