Report on Sheveluch (Russia) — 4 June-10 June 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
4 June-10 June 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Sheveluch (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 4 June-10 June 2008. 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 seismic activity at Shiveluch was slightly above background levels on 29 and 30 May and at background levels during 31 May-6 June. Gas-and-ash explosions may have occurred on 29-30 May and 3 June, possibly sending plumes to an altitude of 3.6 km (11,800 ft) a.s.l. According to video footage and visual observations, moderate fumarolic activity was noted during 31 May and 1-5 June. Observations of satellite imagery revealed a daily thermal anomaly in the crater, and a gas-and-steam plume that drifted 20 km WNW on 31 May. The Level of Concern Color Code remained at Orange.
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.