Report on Sheveluch (Russia) — 31 January-6 February 2007
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 31 January-6 February 2007
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2007. Report on Sheveluch (Russia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 31 January-6 February 2007. Smithsonian Institution and US Geological Survey.
56.653°N, 161.36°E; summit elev. 3283 m
All times are local (unless otherwise noted)
Activity at Shiveluch continued above background levels during 26 January-2 February, with over 140 shallow earthquakes occurring daily. Based on seismic interpretation, observation, and video data, gas-and-ash plumes rose 3.5-4.5 km (11,500-14,800 ft) a.s.l. throughout the reporting period. Plumes drifted ESE. A large thermal anomaly was visible on satellite imagery. The Tokyo VAAC reported ash plumes that rose to an altitude of 4.3 km (14,000 ft) a.s.l. on 1 February were visible on satellite imagery drifting E. An eruption occurred on 6 February that was not visible on satellite imagery. 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.