Global Volcanism Program | Image GVP-07606
Santa Ana is seen here from the east on the rim of Coatepeque caldera. The eastern rim of Santa Ana's summit crater was breached and produced the gently sloping deposits extending towards the caldera lake to the lower right. The NW wall of the caldera in the background cuts into the flanks of Santa Ana. This SW part of Coatepeque caldera formed about 57,000 years ago during the eruption of about 16 km3 of rhyolite pumice and pyroclastic flow deposits.
Photo by Lee Siebert, 1999 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.