Global Volcanism Program | Image GVP-06043
Scientists investigating a lava flow from Krafla volcano are silhouetted (lower right) against the glowing margin of the slowly advancing flow. This photo was taken on September 5, 1984, the day after the onset of an eruption from the Leihrnjúkur fissure. Cracks on the surface of the advancing flow reveal the still-molten interior.
Photo by Michael Ryan, 1984 (U.S. Geological Survey).