Global Volcanism Program | Image GVP-12795
This outcrop within a barranca (ravine) on the western side of the Santa Ana summit area shows explosive deposits from the 2005, 1904, and older eruptions. The different ash and lapilli units have variable grain sizes, an indication of variations in explosivity. The yellow ruler is 72 cm long; photo taken in 2011.
Photo by Lis Gallant, 2011.
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.