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Report on Sheveluch (Russia) — 12 January-18 January 2005

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 12 January-18 January 2005
Managing Editor: Gari Mayberry

Please cite this report as:

Global Volcanism Program, 2005. Report on Sheveluch (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 12 January-18 January 2005. Smithsonian Institution and US Geological Survey.

Volcano Profile |  Weekly Report (12 January-18 January 2005)


Sheveluch

Russia

56.653°N, 161.36°E; summit elev. 3283 m

All times are local (unless otherwise noted)


During 8-14 January, seismicity decreased slightly at Shiveluch but remained above background levels. Seismicity indicated that from 1815 to 1945 on 13 January, several ash explosions up to 5 km a.s.l. and a pyroclastic flow probably occurred. Possible weak ash-and-gas explosions and hot avalanches occurred during 8-14 January. According to visual observations and video data, gas-and-steam plumes rose up to ~2.5-3.4 km a.s.l. during 6-8 January and on 12 January. Shiveluch remained at Concern Color Code Orange.

The Tokyo VAAC reported an eruption of Shiveluch on 17 January at 1625 with a plume that rose to a height of ~4.5 km a.s.l.

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.

Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC)