Report on Avachinsky (Russia) — 24 October-30 October 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
24 October-30 October 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Avachinsky (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 24 October-30 October 2001. Smithsonian Institution and US Geological Survey.
53.256°N, 158.836°E; summit elev. 2717 m
All times are local (unless otherwise noted)
During 19-26 October several gas-and-steam plumes rose above Avachinsky's crater, with the highest plume reaching 1 km and extending 20 km to the SE on 20 October. Seismic activity continued above background levels; ten earthquakes occurred with magnitudes of 1.3-2.1. The volcano remained at Concern Color Code Yellow.
Geological Summary. Avachinsky, one of Kamchatka's most active volcanoes, rises above Petropavlovsk, Kamchatka's largest city. It began to form during the middle or late Pleistocene, and is flanked to the SE by Kozelsky volcano, which has a large crater breached to the NE. A large collapse scarp open to the SW was created when a major debris avalanche about 30,000-40,000 years ago buried an area of about 500 km2 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 7,000 years BP. Most eruptions have been explosive, with pyroclastic flows and hot lahars being directed primarily to the SW by the collapse scarp, although there have also been relatively short lava flows. The frequent historical eruptions have been similar in style and magnitude to previous Holocene eruptions.