Report on Sheveluch (Russia) — 11 July-17 July 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
11 July-17 July 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Sheveluch (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 11 July-17 July 2001. Smithsonian Institution and US Geological Survey.
56.653°N, 161.36°E; summit elev. 3283 m
All times are local (unless otherwise noted)
Seismic activity remained above background levels during 6-13 July. Many small earthquakes were recorded within the volcano's edifice, along with weak spasmodic tremor and other local seismic signals, interpreted as related to explosions, avalanches, and collapses. On 6 July explosions sent ash to 0.6-1 km above the volcano. In addition, hot avalanches and pyroclastic flows were observed during clear conditions to be traveling down the flanks of the volcano. The Concern Color Code remained at Yellow.
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.