53°15' N, 158° 51' E; summit elevation. 2,741 m
Avachinsky, one of Kamchatka's most active volcanoes, rises above Petropavlovsk. It’s height 2751 m. Avachinsky consists of the Late Pleistocene edifice, destroyed by a large horseshoe-shaped crater, breached to the southwest, which encloses the Young Cone stratovolcano.The crater
is believed to have formed about 30,000 years ago as a result of a huge debris avalanche, the deposits of which underlie the present city. Avachinsky has been classified as a Somma volcano based on its similarities with Vesuvius.
Despite the activity the volcano is available for visitors. People, even having no any experience, supervised by guides can reach the crater for 6-8 hours. From the top of the volcano one can see the scenery panorama of giant cone of Koryaksky Volcano,
northward from the cone the valley of Nalycheva River spreads widely and several ridges behind. To the East one can see Kozelsky Volkano. Petropavlovsk, Avachinskaya Bay and ocean can been seen in the south direction.
Holocene activity of the volcano started about 7250 14C yrs B.P. after a long repose period. During the first stage of its life (7250-3500 14C yrs B.P) Avachinsky produced explosive eruptions with ash-falls and pyroclastic 
flows. The eruptive center at this time probably was presented by coalescent extrusive domes (similar to modern Young Shiveluch), nested in the Late Pleistocene debris avalanche crater. Ashes of these eruptions can be traced at a distance of more than 200-400 km. Volcanic material was dominated by low-K andesite.
About 3500 14C yrs BP the composition of the products shifted to basaltic andesites and frequent eruptions gave the birth to the Young Cone stratovolcano, located in the Late Pleistocene crater. One of the initial explosive eruptions AV1 produced more than 4 km3 of basaltic andesite tephra which was dispersed at a distance of more than 300 km to the north and formed one of the main marker ash layers for this area. The Young Cone produced multiple explosive and effusive eruptions, the most recent in 1991 and 2001.
Pyroclastic flow deposits fill most of the valleys on the volcano's slopes. Tephra layers are well seen at the foot of the volcano, some of them can be traced at a distance of more than 200-400 km away from the volcano and represent good markers for the Holocene stratigraphy (Braitseva et al., 1997, 1998).
1737 - explosive eruptions
1772 - explosive eruptions
1779 - explosive eruptions
1827 - explosive eruption
1855 - explosive eruptions
1878 - explosive eruptions
1881 - explosive eruptions
1894-1895 - effusive-explosive eruptions
1901 - explosive eruption
909 - explosive eruption
1926 - effusive-explosive eruption
1927- explosive eruption
1938 - effusive-explosive eruption
1945 - explosive eruptions
1991 - effusive-explosive eruption
2001 - single ash explosion