Report on Sheveluch (Russia) — 17 October-23 October 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
17 October-23 October 2007
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2007. Report on Sheveluch (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 17 October-23 October 2007. 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 above background levels during 12-19 October. Based on seismic interpretation, ash plumes rose to an altitude of 6.5 km (21,300 ft) a.s.l. and small hot avalanches occurred. Observations of video footage indicated that gas and occasionally ash plumes rose to altitudes of 5.5 km (18,000 ft) a.s.l. during 11-12 and 14-15 October. Based on observations of satellite imagery, ash plumes drifted E on 12, 14, and 16 October and a thermal anomaly was present in the crater every day during the reporting period. The Level of Concern Color Code remained at Orange.
Based on information from the KEMSD, the Tokyo VAAC reported that eruption plumes rose to altitudes of 4.6-6.7 km (15,000-22,000 ft) a.s.l. on 18, 20, 22, and 23 October.
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.