A vertical view into the crater lake of Poás volcano in December 1999 shows a gas plume (bottom center) originating from a vent in the south side of the lake. December plume heights ranged between 0.7 and 1 km. The 800-m-wide crater contains an acidic lake.

Photo by Federico Chavarria Kopper, 2000.

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

Keywords: crater | crater lake | emissions | gas | tephra

Poás