Report on Sheveluch (Russia) — 10 June-16 June 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
10 June-16 June 2009
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2009. Report on Sheveluch (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 10 June-16 June 2009. 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 during 5-11 June seismic activity from Shiveluch was above background levels. Based on interpretations of seismic data, diffuse ash plumes were emitted during the reporting period; ash plumes possibly rose to altitudes of 4.8-7.7 km (16,000-25,300 ft) a.s.l. during 6 and 10-11 June. Video camera images showed steam-and-gas emissions. Analysis of satellite imagery revealed a daily thermal anomaly over the lava dome, and ash plumes that drifted 90 km S on 6 and 7 June. The Level of Concern Color Code remained at Orange. Based on analysis of satellite imagery and information from KEMSD, the Tokyo VAAC reported that during 11-12 and 14-15 June eruptions produced plumes that rose to altitudes of 6.1-7.9 km (20,000-26,000 ft) a.s.l. A possible eruption was seen on satellite imagery on 13 June.
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.