Global Volcanism Program | Image GVP-04036
The flat floor of the 5-km-wide Retana caldera between Suchitán and Tahual volcanoes is now used for farmland. The steep-sided caldera walls range up to 250 m in height, and a low notch on the northern rim (left-center) drains the caldera. The caldera was considered to have formed mainly by subsidence; the volume of dacitic pumice and lithic fragments associated with caldera formation is insufficient to account for the 1.5 cu km volume of the caldera.
Photo by Lee Siebert, 1993 (Smithsonian Institution).