Global Volcanism Program | Image GVP-04299
Poás, one of the most active volcanoes of Costa Rica, is a broad, well-vegetated volcano with a summit area containing three craters along a N-S line. The 2708-m-high volcano is constructed within eroded remnants of two nested calderas. This photo from the east shows the lake-filled Botos crater (left center) and a steam plume rising from the historically active summit crater, which has been the site of frequent phreatic and phreatomagmatic eruptions since 1828. Eruptions often include geyser-like ejection of crater lake water.
Photo by Mike Carr (Rutgers University).