Ash and mud from a small phreatic explosion rise above the degassing Poás crater lake on 28 August 1988. Phreatic explosions had been occurring since June of the previous year and lasted for a few more months beyond August 1988. Activity was nearly continuous during the second half of August and the first week of September, with plumes containing mud rising 5-10 m. During the rest of the month plumes rose as much as 25 m. Small explosions continued, and by April 1989 the crater lake disappeared.

Photo by E. Valverde, 1988 (published in Barquero, 1998)

This image is made available under the Creative Commons BY-NC-ND 4.0 license terms.

Keywords: phreatic | crater | eruption | gas | emissions | crater lake | ash plume | plume | cock’s-tail plume

Poás