Name: Atsonupuri
GVP Number: 290050
Synonims: Atosanupuri, Araisa, Atosa, Etorofu-Atosanupuri
Region: Kuril Islands
Volcanic Area: Southern Kuriles
Coordinates: 44°48'25" N 147°7'49" E
Absolute Elevation: 1206 m
Status: Active
Aviation Color Code: GREEN
Location: Atsonupuri volcano is located in the southern part of Iturup Island
Type: Stratovolcano
Composition: basic andesites, basalts
Last known eruption: 1932
The volcano has a structure of the Somme-Vesuvius type. A somma with a diameter of 2 km was preserved only on the southeast side, its eastern and western parts are hidden under the deposits of the young cone. The central cone rises to 1205 m above sea level, or about 300 m above the crest of the caldera. In the southeast, between the crest of the somma and the slope of the central cone, there is a small flat atrio, and in the northwest the slopes of the cone descend to the seashore and then, without interruption and without underwater terraces, go to a depth of more than 1000 m. Crater of the central cone elongated from southwest to northeast and has the shape of an oval funnel 400 X 500 m in size with a depth of more than 100 m. In the northeast and southwest, the crater ridge has noticeable depressions; a large pothole stretches along the slope to the northwest of the crater; similar potholes are also found in the northwest of the cone. The slopes are covered mainly with slag and slag bombs. In the cliffs of the crater walls and the sources of the potholes, layers of lava flows are exposed. The ends of the flows, sometimes with a wavy surface, emerge on the seashore.

Горшков Г.С. Вулканизм Курильской островной дуги / Отв. ред. Рудич К.Н. М.: Наука. 1967. 288 с.
Горшков Г.С. Каталог действующих вулканов Курильских островов // Бюллетень вулканологических станций. 1957. № 25. С. 96-178.
Potencial Hazard
Ash clouds, ash falls, hot avalanches and lahars are a potential hazard associated with explosive eruptions of this volcano. The volcano poses a potential hazard to international and local airlines passing in the Kuriles region, since the height of its ash emissions can reach 10-15 km above sea level, ash plumes and clouds can drift hundreds of kilometers from the volcano in different directions. In addition, the outflow of lava flows onto the slopes of the volcano and the surrounding area is possibly.
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