Report on Sheveluch (Russia) — 5 August-11 August 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 August-11 August 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, 5 August-11 August 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 31 July-7 August seismic activity from Shiveluch was above background levels. Analyses of satellite imagery revealed a large daily thermal anomaly over the lava dome. Based on interpretations of seismic data, ash plumes possibly rose to an altitude of 7.5 km (24,600 ft) a.s.l. Steam-and-gas plumes with some ash content were also noted. According to video camera data, ash plumes rose to an altitude of 4 km (13,100 ft) a.s.l. on 2 August; gas-and-steam plumes rose to an altitude of 3.5 km (11,500 ft) a.s.l. on 2 and 4 August. The Level of Concern Color Code remained at Orange.
Based on analyses of satellite imagery and information from KEMSD, the Tokyo VAAC reported that on 6 and 9 August eruptions produced plumes that rose to altitudes of 4.6-5.2 km (15,000-17,000 ft) a.s.l.
Geologic Background. The high, isolated massif of Sheveluch volcano (also spelled Shiveluch) rises above the lowlands NNE of the Kliuchevskaya volcano group. The 1300 km3 volcano is one of Kamchatka's largest and most active volcanic structures. 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 dot its outer flanks. The Molodoy Shiveluch lava dome complex was constructed during the Holocene within the large horseshoe-shaped caldera; Holocene lava dome extrusion also took place on the flanks of Stary Shiveluch. At least 60 large eruptions have occurred during the Holocene, making it the most vigorous andesitic volcano of the Kuril-Kamchatka arc. 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.