The eastern crater rim of Santa Ana rises more than 100 m above the crater floor. The eastern wall is composed of breccias, scoria units, thin lava flows, and dikes. Thick sequences of lava flows are exposed in the northern and southern crater walls and on the southern side they are overlain by phreatomagmatic tephra layers up to 100 m thick.

Photo by Lee Siebert, 2002 (Smithsonian Institution).

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

Keywords: crater | vent | stratigraphy | outcrop | geology

Santa Ana