Report on Sheveluch (Russia) — April 1991
Bulletin of the Global Volcanism Network, vol. 16, no. 4 (April 1991)
Managing Editor: Lindsay McClelland.
Sheveluch (Russia) Possible new tephra deposit on E flank
Please cite this report as:
Global Volcanism Program, 1991. Report on Sheveluch (Russia). In: McClelland, L (ed.), Bulletin of the Global Volcanism Network, 16:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199104-300270.
56.653°N, 161.36°E; summit elev. 3283 m
All times are local (unless otherwise noted)
After the 8 April explosive eruption, satellite images showed an apparent narrow zone of tephra deposited SE from the summit to the coast. The NOAA 10 polar orbiter showed a second, similar deposit on 9 May at 1000, extending E from the summit then turning SE to parallel the 8 April material. . . .
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: W. Gould, NOAA/NESDIS.