Report on Sheveluch (Russia) — 7 January-13 January 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
7 January-13 January 2009
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2009. Report on Sheveluch (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 7 January-13 January 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 2-9 January. Based on interpretations of seismic data, ash plumes rose to an altitude of 8.8 km (28,900 ft) a.s.l. on 7 January and to an altitude of 5.7 km (18,700 ft) a.s.l. on the other days during the reporting period. Analysis of satellite imagery revealed a large daily thermal anomaly on the lava dome and an ash plume that drifted 25 km W on 6 January. Gas-and-steam emissions were seen on 2, 4, and 6 January. Ash deposits were noted in areas about 10 km SW on 7 January. The Level of Concern 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.