Types of dome collapse. Pyroclastic flows at Redoubt Volcano are caused primarily by collapse of the lava dome (modified from Cas and Wright, 1987). Figure from: Waythomas, C. F., Dorava, J. M., Miller, T. P., Neal, C. A., and McGimsey, R. G., 1998, Preliminary volcano-hazard assessment for Redoubt Volcano, Alaska: U.S. Geological Survey Open-File Report OF 98-0857, 40 p.
Image courtesy of AVO/USGS.