The Poás crater lake is seen here on 4 October 1987 during an intermittent eruption lasting from June 1987 to June 1990. Sporadic small phreatic explosions had started in June 1987 and continued until at least October 1988. The crater lake disappeared by April 1989, and in the following month ash plumes reached heights of 1.5-2 km above the crater.

Photo by José Enrique Valverde Sanabria, 1987 (courtesy of Eduardo Malavassi, OVSICORA-UNA).

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

Poás