KVERT reported that seismic activity at Kliuchevskoi was above background levels during 21-28 November; Strombolian activity and lava effusion continued. On 21 November, a lava flow traveled 1.5-1.8 km down the NW flank. Gas-and-steam plumes drifted 80 km NW on 24 November and 20-40 km SE during 25-26 November. Gas-and-steam plumes containing slight amounts of ash rose to altitudes of 5.3-5.5 km (17,400-18,000 ft) a.s.l. during 26-27 November. Analysis of satellite imagery revealed a large daily thermal anomaly in the crater during 21-28 November. The Level of Concern Color Code remained Orange.

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)