Report on Sheveluch (Russia) — July 1993
Bulletin of the Global Volcanism Network, vol. 18, no. 7 (July 1993)
Managing Editor: Edward Venzke.
Sheveluch (Russia) Gas-and-steam plume continues
Please cite this report as:
Global Volcanism Program, 1993. Report on Sheveluch (Russia). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 18:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199307-300270.
56.653°N, 161.36°E; summit elev. 3283 m
All times are local (unless otherwise noted)
A gas-and-steam plume was observed on the afternoon of 29 July rising to 3 km above the crater and extending >50 km S. Similar activity, with a gas-and-steam column rising 1-6 km above the rim, has persisted since the 22 April eruption. The volcano has also remained seismically active. Seismicity registered at a station 8 km from the volcano increased 23-24 and 28-29 July, then decreased after 1 August. Weather conditions prevented visual observations of the summit in early August.
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.
Information Contacts: S. Zharinov, IVGG.