Global Volcanism Program | Image GVP-06240
Caldeira do Alferes (center) is one of a group of six pyroclastic cones constructed on the floor of Sete Cidades caldera. The adjacent cone of Seara appears to the right of Caldeira do Alferes in this view from the western caldera rim. Strong eruptions of trachytic pumice occurred a dozen times during the past 5000 years from Sete Cidades, one of the most active volcanoes of the Azores.
Photo by Rick Wunderman, 1997 (Smithsonian Institution).