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Avachinsky Volcano, Russia
Avachinsky, one of Kamchatka's most active volcanoes, rises above Petropavlovsk, Kamchatka's largest city.
The shoulder at the right is the rim of a large horseshoe-shaped caldera, breached to the SW, that was formed about 30,000-40,000 years ago when a major debris avalanche buried an area of about 500 sq km to the south underlying the city of Petropavlovsk.
Construction of the modern, 2741-m-high cone inside the breached caldera followed.
Frequent historical eruptions have been recorded since 1737.
PHOTO SOURCE: Oleg Volynets, 1985 (Institute of Volcanology, Petropavlovsk), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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