Located on Russia's Kamchatka Peninsula, Klyuchevskaya (also spelled Kliuchevskoi) is one of the world's most active volcanoes. More than 100 flank eruptions have occurred at the stratovolcano in the past 3,000 years, according to Smithsonian's Global Volcanism Program. Twelve confirmed eruptions have occurred since 2000.
Klyuchevskaya has been erupting since August 15, 2013, though the intensity of activity surged in October. The Kamchatka Volcanic Eruption Response Team (KVERT) reported a thick plume of ash and steam streaming from the summit on October 11. Subsequent days brought explosive eruptions, lava fountains, and volcanic tremors. At times, the ash plume rose from the summit (elevation 5 kilometers, or 16,000 feet) up to 7.5 to 10 kilometers (24,000 to 32,000 feet).