Global Volcanism Program | Image GVP-02669
Remnants of four lava domes can be seen in this annotated July 1986 photo of the summit of Augustine taken from the north. Degassing of the 1986 lava dome produces a plume. Eruptions have often begun with the explosive removal of portions of lava domes capping the summit and conclude with the extrusion of a new lava dome. Renewed extrusion of the 1986 dome occurred one month after the time of this photo.
Photo by Lee Siebert, 1986 (Smithsonian Institution).