Global Volcanism Program | Image GVP-04303
A plume containing ash and mud erupts through the Poás crater lake in July 1977 when phreatic explosions were produced at 25-minute intervals. This activity had begun in May 1977.
Photo by S. Racchini, 1977 (Universidad Nacional Costa Rica, courtesy of Jorge Barquero).
This image is made available under the Creative Commons BY-NC-ND 4.0 license terms.