Sierra Negra (Galapagos)
Sierra Negra is the shield volcano at the southern end of Isabela Island. It contains a shallow 710 km caldera that is the largest in the Galapagos Islands. Although Sierra Negra is the largest of the five major Isabela volcanoes, it has the flattest slopes, averaging less than 5 degrees and diminishing to 2 degrees near the coast. Volcan de Azufre, the largest fumarolic area in the Galapagos Islands, lies within a graben between this ridge and the west caldera wall. Sierra Negra, along with Cerro Azul and Volcan Wolf, is one of the most active of the Isabela Island volcanoes
External links
Smithsonian Institution's Global Volcanism Program - Sierra Negra
CBS News: Galapagos Volcano Erupts for Third Day
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article Sierra Negra (Galapagos)
