Global Volcanism Program | Image GVP-00763
Ash plume rose above Raung volcano on 10 and 12 September, and 3 October 1991. Although the initial report was of flank vent activity, photographs such as this one on 12 September taken from the south, show the eruption occurring at the summit caldera and the plume being dispersed by the wind to the NW.
Photo by Jeff Post, 1991 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.