Global Volcanism Program | Image GVP-04124
Winds deflect an ash column originating from the summit crater of Cerro Negro in 1968. At the same time a vent on the lower south flank, which is emitting a thin, lighter-colored steam column in this view, fed a lava flow. The advancing flow forms the black lobe extending to the lower left corner of the photo. The 1968 eruption began on October 23 and continued until December 15.
Photo by William Melson, 1968 (Smithsonian Institution).