The village of Furnas (right) lies in the center of Furnas caldera, whose northern rim forms the ridge in the background. The largest eruption in the last 5,000 years originated at a vent where the village is now located. This Plinian eruption, named Furnas C, occurred about 1,900 years ago. Activity varied between phreatomagmatic and magmatic styles, producing massive fallout of pumice and ash and pyroclastic flows and surges.

Photo by Rick Wunderman, 1997 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Keywords: caldera

Furnas