Global Volcanism Program | Image GVP-06222
The village of Furnas (right) lies in the center of Furnas caldera, whose northern rim forms the ridge in the background. The largest post-caldera Furnas tephra, layer C, originated from a vent where part of the village of Furnas is now located. The eruption was dated at about 2900 years before present. Plinian and sub-plinian eruptions deposited airfall-pumice and -ash, accompanied by local pyroclastic flows and late-stage mudflows.
Photo by Rick Wunderman, 1997 (Smithsonian Institution).