This view of the less-frequently seen northern side of Irazú's summit crater complex shows fumaroles rising from vents below a steep escarpment cutting the outer NW flank of the volcano's main crater (which lies behind the high point on the left horizon). This thermal area, known as Las Fumaroles, was the source of an explosive eruption in December 1994 that also produced an avalanche and mudflow down the Río Sucio, the valley at the lower right.

Photo by Jorge Barquero, 1994 (Universidad Nacional Costa Rica).

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

Irazú