Global Volcanism Program | Image GVP-04044
The inner crater of Santa Ana is 500 m wide and is partially filled by a 250-m-wide greenish crater lake in this 1966 photo. Fumaroles are active on the crater wall and in the lake, and abundant sulfur deposits are located on the SW wall (upper left). The acidic crater lake has a pH of about 1, and bathymetric surveys have revealed a maximum depth of 27 m.
Photo by Dick Stoiber, 1966 (Dartmouth College).
This image is made available under the Creative Commons BY-NC 4.0 license terms.