The Koryak volcano is part of the Avacha group. It is located to the north-west of the Avacha volcano, 35 kilometers from Petropavlovsk-Kamchatskiy. This is a typical stratovolcano, composed of a plurality of layers of hardened lava, with a regular ribbed cone, the summit cut to the west. The uppermost peak of the volcano stands at 3,456 meters.
Two glaciers run down the north-eastern slope in deep furrows from the crater with a diameter of about 500 meters. The first glacier is 1 kilometer long, the second — 4.2 kilometers. In the western part of the summit stand the the remains of a cup-shaped crater with a diameter of 180-200 meters. The crater is open to the south and a small, relatively fresh lava stream flows down from it.
One of the biggest eruptions of lava took place in 1896. Until 1955, the volcano showed no signs of activity, with the exception of very light steaming from the crater. In 1955, the fumarolic activity increased sharply, and at the end of the same year, under the pressure of internal gas, a crack about 500 meters long and 10-15 meters wide appeared on the western slope. A long trail of fumes and gases burst out of the crack with a loud noise. There is some steaming from this crack even now.
In December 2008, local residents witnessed the release of ashes and gases. The smoke plume stretched for nearly a hundred kilometers.
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