Report on Sheveluch (Russia) — 11 April-17 April 2012
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 11 April-17 April 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, 11 April-17 April 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 explosive activity at Shiveluch continued during 7-13 April. Ground-based observers and satellite imagery indicated that a viscous lava flow continued to effuse in the crater formed during a 2010 eruption. Satellite imagery showed a weak thermal anomaly daily on the lava dome, and ash plumes that drifted 210 km SW and SE on 6, 8, and 11 April. Seismic data indicated that ash plumes potentially rose to an altitude of 7.7 km (25,000 ft) a.s.l. during 7-8 and 10-12 April, and to an altitude of 4.5 km (14,800 ft) a.s.l. on the other days. Observers confirmed that an ash plume rose to an altitude of 5 km (16,400 ft) a.s.l. on 8 April. 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.