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).