Global Volcanism Program | Image GVP-00956
An ash plume rises above a pyroclastic flow traveling down the Buang valley on the upper NW flank of Mayon volcano in the Philippines on 12 September 1984. The front of the advancing pyroclastic flow is visible at the lower right. These pyroclastic flows traveled down to 100 m elevation at rates of about 20 m/s.
Photo by Olimpio Pena, 1984 (Philippine Institute of Volcanology and Seismology).