The summit crater of San Miguel volcano reflects a complex sequence of events. This view from the northern crater rim shows two lava benches that are truncated by a deep compound central pit crater from which steam plumes rise. The morphology of the summit crater has varied dramatically during historical time. The inner pit crater has gradually expanded to the east and north and increased in depth to nearly 350 m in 1999.

Photo by Lee Siebert, 1999 (Smithsonian Institution).

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

San Miguel