File:Pyroclasticflow usgs.jpg

Photograph by C. Newhall on 15 September 1984. USGS - Public domain.

Pyroclastic flow sweeps down the side of Mayon Volcano, Philippines, during an explosive eruption on 15 September 1984. Note the ground-hugging cloud of ash (lower left) that is billowing from the pyroclastic flow and the eruption column rising from the top of the volcano.