Report on Ushkovsky (Russia) — March 1982
Scientific Event Alert Network Bulletin, vol. 7, no. 3 (March 1982)
Managing Editor: Lindsay McClelland.
Ushkovsky (Russia) Glacier surge
Please cite this report as:
Global Volcanism Program, 1982. Report on Ushkovsky (Russia). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 7:3. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198203-300261.
56.113°N, 160.509°E; summit elev. 3943 m
All times are local (unless otherwise noted)
The volcano's 17-km-long Bilchenok Glacier has begun to advance. The glacier, located in Plosky's caldera, has three large ice cascades on its NW flank. Previous surges of this glacier occurred in 1959, 1976, and 1977. Photo reconaissance flights over Kamchatkan glaciers 10-11 March revealed that Bilchenok's front was 1 km from its 1980 position and 500 m from the 1959 maximum surge. Its surface was broken into blocks, and rupture disturbances of the snow cover were observed.
Further Reference. Ovsyannikov, A.A., Khrenov, A.P., and Murav'yeva, Y.D., 1985, Recent activity of the Dal'nya Ploskaya volcano: Volcanology and Seismology, no. 5, p. 97-98.
Geologic Background. Ushkovsky volcano (formerly known as Plosky) is a large compound volcanic massif located at the NW end of the Kliuchevskaya volcano group. It consists of the flat-topped Ushkovsky (Daljny Plosky), which is capped by an ice-filled 4.5 x 5.5 km caldera, and the adjacent slightly higher peak of Krestovsky (Blizhny Plosky) volcano. Two glacier-clad cinder cones with large summit craters form a high point within the Ushkovsky caldera. Linear zones of cinder cones are found on the SW and NE flanks and on lowlands to the west. The younger caldera at the summit of Daljny was formed in association with the eruption of large lava flows and pyroclastic material from the Lavovy Shish cinder cones at the foot of the volcano about 8600 years ago. The only known historical activity was an explosive eruption from the summit cone in 1890.
Information Contacts: V. Vinogradov, IVP.