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Report on Sheveluch (Russia) — 23 January-29 January 2008


Sheveluch

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 23 January-29 January 2008
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2008. Report on Sheveluch (Russia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 23 January-29 January 2008. Smithsonian Institution and US Geological Survey.

Weekly Report (23 January-29 January 2008)

Sheveluch

Russia

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 slightly above background levels during 18-25 January. Based on seismic interpretation, ash plumes rose to an altitude of 4.3 km (14,100 ft) a.s.l. during 17-18, 20, and 23 January. Fumarolic activity was noted on 19, 20, and 22 January. Based on observations of satellite imagery, a thermal anomaly was present in the crater every day during the reporting period. 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.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)