Global Volcanism Program | Image GVP-02477
A lava flow travels down the NW flank of Klyuchevskoy in this January 1986 view from the town of Klyuchi. Explosive activity commenced at the summit on 16 August 1985 and lava flow emission began on 5 November, accompanied by intensive summit explosive activity. On 2 December strong phreatic explosions from a NW flank fissure ejected material that reached 10 km, and on 1-2 December, a mudflow traveled 35 km. The summit crater eruption ended on 21 January 1986.
Photo by Alexander Belousov, 1986 (Institute of Volcanology, Petropavlovsk).