56°03'N, 160°39'E, summit elevation 4750 m; Last Eruption 2007
It is a typical stratovolcano with a regular cone and a summit crater of 700 m in diameter. About 80 lateral explosive vents and scoria cones are situated on the flancs of the volcano 500-3600 m ASL.
Hazards are caused by ash plumes, ash falls, lava and mud flows. Ash falls produced by powerful explosive
eruptions, mudflows present potential hazard for Klyuchi and other settlements and structures situated close to the volcano.
Klyuchevskoy volcano exposes high potential hazard to the aircrafts flying over Kamchatka because its eruptive clouds can rise to a height of 10-15 km ASL and extend for hundreds of kilometers and duration of eruptions can exceed a few months.
Ash falls possible at:
Klyuchi (30 km to the north from the volcano)
Kozyrevsk (47 km to the west)
Esso (120 km to the west)
Ust’-Kamchatsk (120 km to the east)
Milkovo (200 km to the south-west)
Petropavlovsk-Kamchatsky (360 km to the south-south-west).