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Avachinsky (also known as Avacha or Avacha Volcano or Avachinskaya Sopka) () is an active stratovolcano in Russia. It is situated on the Kamchatka Peninsula in the Russian Far East. Avachinsky lies within sight of Petropavlovsk-Kamchatsky, the capital of Kamchatka Krai. Together with neighbouring Koryaksky volcano, it is considered a Decade Volcano, worthy of particular study in light of its history of explosive eruptions and proximity to populated areas.
Avachinsky's last eruption occurred in 2008. This eruption was relatively small in comparison to the volcano's major Volcanic Explosivity Index 4 eruption in 1945.
The volcano is one of the most active volcanoes on the Kamchatka Peninsula, and began erupting in the middle to late Pleistocene era. It has a horseshoe-shaped caldera, which formed 30-40,000 years ago in a major landslide which covered an area of south of the volcano, underlying the city of Petropavlovsk-Kamchatsky. Reconstruction of a new cone inside the caldera occurred in two major eruption phases, 18,000 and 7,000 years ago....
The volcano continues to experience frequent and many exist near the summit. The temperature of gases emitted at these fumaroles has been measured at over . In light of its proximity to Petropavlovsk-Kamchatsky, Avachinsky was designated a Decade Volcano in 1996 as part of the United Nations' International Decade for Natural Disaster Reduction together with the nearby Koryaksky volcano.
Recently, the volcano had experienced an eruption along with six other in the peninsula, that being Bezymianny, Klyuchevskoi, Krasheninnikov, Shiveluch, Karymsky, and Kambalny shortly after a Mw 8.8 Megathrust earthquake happened nearby on July 30th, 2025.
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