Report on Avachinsky (Russia) — August 1993

Bulletin of the Global Volcanism Network, vol. 18, no. 8 (August 1993)
Managing Editor: Edward Venzke.

Avachinsky (Russia) Intense fumarolic activity

Please cite this report as:

Global Volcanism Program, 1993. Report on Avachinsky (Russia). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 18:8. Smithsonian Institution.

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53.256°N, 158.836°E; summit elev. 2717 m

All times are local (unless otherwise noted)

Summit crater observations were made by SVE team members during an overflight on 24 August. Fumarolic activity was very intense on and around the crater, and a very active fumarole field, with many yellow sulfur deposits, occupied a large area just below the rim on the SW slope. No fresh lava was visible on the surface of the lava plug that filled the summit crater . . . during the January 1991 eruption.

Geologic Background. Avachinsky, one of Kamchatka's most active volcanoes, rises above Petropavlovsk, Kamchatka's largest city. Avachinsky began to form during the middle or late Pleistocene and is flanked to the SE by the parasitic volcano Kozelsky, which has a large crater breached to the NE. It has a large horseshoe-shaped caldera, breached to the SW, that was formed when a major debris avalanche about 30,000-40,000 years ago buried an area of about 500 sq km to the south underlying the city of Petropavlovsk. Reconstruction of the volcano took place in two stages, the first of which began about 18,000 years before present (BP), and the second 7000 years BP. Most eruptive products have been explosive, with pyroclastic flows and hot lahars being directed primarily to the SW by the breached caldera, although relatively short lava flows have been emitted. The frequent historical eruptions have been similar in style and magnitude to previous Holocene eruptions.

Information Contacts: H. Gaudru, SVE, Switzerland.