Global Volcanism Program | Image GVP-06030
A steam plume rises above a line of lava fountains on September 5, 1984, the day after the onset of an eruption from an 8.5-km-long fissure extending north from Leirhnjúkur. During the first hours of the eruption, the fissure was active along its entire length, but later activity was concentrated at a single vent near the northern end of the fissure. This fissure-fed eruption was the last of a decade-long series of Krafla eruptions beginning in 1975 that accompanied an episode of crustal spreading.
Photo by Michael Ryan, 1984 (U.S. Geological Survey).