Report on Sheveluch (Russia) — 21 July-27 July 2010
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 21 July-27 July 2010
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2010. Report on Sheveluch (Russia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 21 July-27 July 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 during 16-23 July seismic activity from Shiveluch was above background levels, possibly indicating weak ash explosions from the lava dome. According to visual observations, gas-and-steam plumes rose daily to an altitude of 3.7 km (12,100 ft) a.s.l. and ash plumes rose to an altitude of 5.5 km (18,000 ft) a.s.l. on 20 and 21 July. Satellite imagery showed a large daily thermal anomaly over the lava dome and ash plumes that drifted 50 km NE on 21 July. The Aviation Color Code level 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.