Report on Sheveluch (Russia) — 21 October-27 October 2009
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 21 October-27 October 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, 21 October-27 October 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 during 16-23 October seismic activity from Shiveluch was above background levels and possibly indicated that ash plumes rose to an altitude of 4.5 km (14,800 ft) a.s.l. Analyses of satellite imagery revealed a large thermal anomaly over the lava dome. According to video camera data and visual observations, multiple hot avalanches traveled down the lava dome. Deposits on the SE flank from a small pyroclastic flow were noted. Fumarolic plumes rose to altitudes of 2.8-5 km (9,200-16,400 ft) a.s.l. during 16, 18-20, and 22 October. The Level of Aviation Color Code 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.