Global Volcanism Program | Image GVP-09633
A vertical view into the crater lake of Poás volcano in December 1999 shows a steam plume (bottom center) originating from the pyroclastic cone on 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 of variable dimensions. The steaming pyroclastic cone was formed during eruptive activity from 1953 to 1955.
Photo by Federico Chavarria Kopper, 2000.