KVERT raised the Concern Color Code at Kliuchevskoi from Green to Yellow during 8-15 November. According to data from KMSD GS RAS, seismicity was above background levels at Kliuchevskoi during the report week. During 8-10 November, five to nine earthquakes occurred per day, and during 11-13 November 33-56 earthquakes occurred per day. Intermittent spasmodic volcanic tremor slowly decreased during 8-12 November. A gas-and-steam plume was seen rising 100-900 m above the crater and extended more than 10 km to the E and SE.

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)