Global Volcanism Program | Image GVP-04308
Geyser-like phreatic eruptions resumed from Poás volcano in June 1987, ejecting lake water and sediments to a maximum reported height of 75 m. This January 23, 1988 photo shows the typical ejection of plumes of gas, ash, and mud above the crater lake. The crater lake disappeared by April 19, 1989 and lithic ash emission began. Mud eruptions resumed when rainy-season waters formed a new lake. During May 1989 ash plumes reached heights of 1.5-2 km above the crater. Phreatic eruptions continued until June 1990.
Photo by Gerardo Soto, 1988 (Instituto Costarricense de Electridad).