KVERT reported that moderate seismic activity from Shiveluch was detected during 5-12 November and a large thermal anomaly over the volcano was observed in satellite imagery. Seismic data suggested that possible ash plumes rose to altitudes of 6.5 and 7 km (21,300 and 23,000 ft) a.s.l. on 6 and 8 November, respectively. Ash plumes were detected in satellite imagery during 7-9 November drifting 150 km SE. An ash plume observed on 10 November rose to an altitude of 5 km (16,400 ft) a.s.l. KVERT noted that growth of the lava dome continued. The Aviation Color Code level remained at Orange.

During 13-14 November, the Tokyo VAAC reported that ash plumes from eruptions were observed in satellite imagery drifting E at altitudes of 4.6-5.2 km (15,000-17,000 ft) a.s.l. A possible eruption on 16 November produced a plume that rose to an altitude of 3.7 km (12,000 ft) a.s.l. and drifted NE.

Geological Summary. The high, isolated massif of Sheveluch volcano (also spelled Shiveluch) rises above the lowlands NNE of the Kliuchevskaya volcano group. The 1,300 km3 andesitic volcano is one of Kamchatka's largest and most active volcanic structures, with at least 60 large eruptions during the Holocene. The summit of roughly 65,000-year-old Stary Shiveluch is truncated by a broad 9-km-wide late-Pleistocene caldera breached to the south. Many lava domes occur on its outer flanks. The Molodoy Shiveluch lava dome complex was constructed during the Holocene within the large open caldera; Holocene lava dome extrusion also took place on the flanks of Stary Shiveluch. Widespread tephra layers from these eruptions have provided valuable time markers for dating volcanic events in Kamchatka. Frequent collapses of dome complexes, most recently in 1964, have produced debris avalanches whose deposits cover much of the floor of the breached caldera.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)