Report on Sheveluch (Russia) — 17 January-23 January 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 17 January-23 January 2007
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2007. Report on Sheveluch (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 17 January-23 January 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 12-19 January, with over 160 shallow earthquakes occurring daily. Based on seismic interpretation, ash plumes rose to 6.5 km (21,300 ft) a.s.l. and avalanches occurred throughout the reporting period. According to observation and video data, gas-and-ash plumes rose to an altitude of 3.5 km (11,500 ft) a.s.l. on 16 January. Plumes drifted SW, NW, and NE on 12 and 14-18 January. A large thermal anomaly over the dome was noted. Based on satellite imagery, the Tokyo VAAC reported that ash plumes rose to an altitude of 6.1 km (20,000 ft) a.s.l. on 22 and 23 January and drifted NW.
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.