Avachinsky-Koriaksky, Russia

Avachinsky (on the right) is one of the most active stratovolcanoes on the Kamchatka peninsula. It consists of a younger cone inside the rim of an older caldera. Avachinsky has been classified as a Somma volcano based on its similarities with Vesuvius. Avachinsky has erupted at least 16 times since 1737. A large (VEI=4) explosive eruption occurred at Avachinsky in 1945. The most recent eruption was in 1991 and produced lava flows, a dome, and mudflows.

Koryaksky is a stratovolcano that stands 10,168 ft (3100 m) above the surrounding plain and is located to the east of Kronotskoe Lake. It is a perfect cone with an ice capped summit. Its summit crater has been completely filled with lava. On the lower parts of its slopes, there are a number of cinder cones. This volcano is located in a belt of fractures running from northeast to southwest. The most recent eruption was in 1956. Moderate-large explosions (VEI=3) produced pyroclastic flows. The eruption lasted about 6 months. Photograph of Kronotsky by Jack Lockwood, U.S. Geological Survey.




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