Report on Sheveluch (Russia) — 20 June-26 June 2012
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 20 June-26 June 2012
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2012. Report on Sheveluch (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 20 June-26 June 2012. 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 15-22 June explosive activity at Shiveluch continued. Visual observations revealed strong gas-and-steam activity on 15, 17, and 21 June; weather conditions prevented observations on the other days. A thermal anomaly on the lava dome was detected in satellite imagery during 15-17, 21, and 24 June. On 24 June video data showed ash plumes that rose to an altitude of 5.3 km (17,400 ft) a.s.l. Based on information from Yelizovo Airport (UHPP) and KEMSD, the Tokyo VAAC reported that ash plumes rose to altitudes of 5.2-9.8 km (17,000-32,000 ft) a.s.l. The Aviation Color Code remained at Orange.
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.