Report on Sheveluch (Russia) — 15 April-21 April 2009
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 15 April-21 April 2009
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2009. Report on Sheveluch (Russia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 15 April-21 April 2009. 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 10-17 April. Based on interpretations of seismic data, ash plumes likely rose to altitudes of 4.5-7.5 km (14,800-24,600 ft) a.s.l. Analysis of satellite imagery revealed a daily thermal anomaly on the lava dome and ash plumes that drifted about 50 km NW on 13 April. According to observers, fumaroles were active on 15 and 16 April. The Level of Concern Color Code remained at Orange. Based on information from KEMSD, the Tokyo VAAC reported that eruptions on 19 and 22 April produced plumes that rose to altitudes of 4.6-5.2 km (15,000-17,000 ft) a.s.l.
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.