Global Volcanism Program | Image GVP-10170
This view shows the western side of Coatepeque caldera (top of the photo) from Cerro Chino scoria cone on the SE flank of Santa Ana, which lies out of view to the left. The caldera rim partially cuts into the eastern side of Santa Ana. The western side of Coatepeque caldera is considered to have formed during the second stage of caldera formation through a lake partially filling the earlier caldera, producing the Congo Formation tephras and pyroclastic flows.
Photo by Lee Siebert, 2002 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.