KVERT issued a Volcano Observatory Notice for Aviation (VONA) for Klyuchevskoy on 12 November, noting that a plume of resuspended ash rose as high as 6 km (19,700 ft) a.s.l. and drifted more than 60 km E. A thermal anomaly detected in satellite images 14 November was 27 degrees Celsius, cooler than to the 115-degree anomaly detected on 1 November. Fumarolic activity persisted. On 15 November the Aviation Color Code was lowered to Green. On 16 November collapses of hot material in the Apakhonchichsky drainage on the SE flank. Ash plumes from the collapses rose to 5 km (16,400 ft) a.s.l. and drifted 140 km E based on webcam images.

Geological Summary. Klyuchevskoy (also spelled Kliuchevskoi) is Kamchatka's highest and most active volcano. Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity. It rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif. More than 100 flank eruptions have occurred during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation. The morphology of the 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century. Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)