Global Volcanism Program | Image GVP-04043
The broad summit of Santa Ana volcano has a 1.5-km-wide crater seen here from the south. The series of bedded phreatomagmatic tephra layers exposed in the crater wall in this photo form the summit region and overlie lava flows exposed lower in the crater walls.
Photo by Dick Stoiber, 1966 (Dartmouth College).
This image is made available under the Creative Commons BY-NC 4.0 license terms.