Global Volcanism Program | Image GVP-04268
A nighttime time-exposure photo of Arenal on 3 April 1990 shows the paths of incandescent blocks that landed on the upper flanks and traveled downhill. Near-constant lava effusion, accompanied by periods of heightened explosive activity, has occurred since a large explosive eruption in 1968.
Photo by William Melson, 1990 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.
Galleries: Ballistic Ejecta