Global Volcanism Program | Image GVP-04258
Arenal is seen here from the west in May 1981, with lava flowing from Crater C near the summit. The eruption began in July 1968 with powerful explosions from three craters on the west flank, with the strongest explosions from Crater A. In subsequent years activity migrated towards the summit and took place primarily from Crater C as well as from Crater D (near the former summit).
Photo by William Melson, 1981 (Smithsonian Institution).