Global Volcanism Program | Image GVP-05533
The irregular ridge on the horizon is the SE rim of the compound 5-km-wide Tepetiltic caldera. The NE caldera was offset from the center of the stratovolcano and its rim is lower to the NE (right). The flanks of the andesitic-dacitic stratovolcano are blanketed by deposits of rhyodacitic ash and pumice from the caldera-forming eruptions. Cinder cones on the NW and SE flanks of the volcano erupted alkalic lava flows.
Photo by Lee Siebert, 1997 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.