The rounded hills in the middle of the photo are part of a chain of lava domes of the Almolonga volcanic field. Partial flank collapse of an edifice sometime prior to 84,000 years ago formed a 3.3-km-wide collapse scarp that is surrounded by a ring-dike configuration of dacite and rhyolite lava domes, seen here from the east. Cerro Quemado is a young dome near the center of the horizon, right of the larger Santa María, that produced a 2.5-km-long lava flow on its eastern flank in 1818.

Photo by Lee Siebert, 1988 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Keywords: lava dome | stratovolcano | caldera

Almolonga

Santa María