Global Volcanism Program | Image GVP-08220
The El Valle de Antón SW caldera rim reaches 300 m above the caldera floor. The caldera formed during major explosive eruptions about 1.1-1.3 million years ago. A former caldera lake contributed to phreatomagmatic and phreatic eruptions that continued into the late Pleistocene. More than 90 m of lake sediments were deposited on the caldera floor prior to draining of the lake.
Photo by Lee Siebert, 1998 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.