Report on Sheveluch (Russia) — 24 November-30 November 2010
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
24 November-30 November 2010
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2010. Report on Sheveluch (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 24 November-30 November 2010. Smithsonian Institution and US Geological Survey.
56.653°N, 161.36°E; summit elev. 3283 m
All times are local (unless otherwise noted)
KVERT reported that moderate seismic activity from Shiveluch was detected during 19-26 November, suggesting that possible ash plumes rose to an altitude of 3.8 km (12,500 ft) a.s.l. A bright thermal anomaly over the volcano was observed in satellite imagery. Ash plumes that rose to an altitude of 5.8 km (19,000 ft) a.s.l. and strong gas-and-steam activity were observed on 19, 20, 22, and 24 November. Ash plumes observed in satellite imagery drifted 408 km E and S during 19-20 and 23-24 November. The Aviation Color Code level remained at Orange.
Based on analyses of satellite imagery, the Tokyo VAAC reported that on 30 November an eruption produced an ash plume that rose to an altitude of 4 km (13,000 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.