Report on Sheveluch (Russia) — 22 September-28 September 2004
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
22 September-28 September 2004
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2004. Report on Sheveluch (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 22 September-28 September 2004. Smithsonian Institution and US Geological Survey.
56.653°N, 161.36°E; summit elev. 3283 m
All times are local (unless otherwise noted)
Seismicity was above background levels at Shiveluch during 23 September to 1 October, with 26 strong shallow earthquakes up to M 2.3 recorded during 23-29 September. Several explosions were seen that produced ash plumes to a maximum height of 4.5 km a.s.l., while interpretations of seismic data suggested that plumes rose to 6.5 km a.s.l. [Correction: According to interpretations of seismic data there were ~20 ash plumes at heights between 4 and 6.5 km a.s.l. Several explosions were confirmed by video observation at a maximum height of 4.5 km a.s.l. Clouds or night obscured the remainder.] An explosion on 25 September was accompanied by small pyroclastic flows. Shiveluch remained at Concern Color Code 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.