30 km north of Petropavlovsk-Kamchatskiy lies the Avacha volcanic ridge, consisting of two active and three extinct volcanoes. The active volcanoes are the Avachinskaya Sopka (Avacha) and Koryakskiy. The extinct peaks are theArik, Aag, and Kozelskiy.
The Avacha volcano is a perfect, regular cone with a height of 2,751 meters above sea level. From the top of the volcano, you can see a magnificent panorama of the giant cone of Koryak, the largest volcano of the Avacha group. To the north lie the upper reaches of the Nalychevo River. Behind them — mountain ridges. To the east, you can see Kozelskiy. To the south — the city and the ocean.
Until recently, the Avacha volcano was among the most active on the Kamchatka Peninsula. It was formed several thousand years ago, and its regular cone was higher than Koryak. Huge explosions demolished the upper part and formed the caldera with a diameter of about 4 kilometers. Five thousand years ago, a new cone began to emerge from the bottom of the caldera. Its modern-day structure makes Avacha a so-called double volcano.
Since the early 20th century, there have been eruptions 1901, 1909-1910, 1926-1927, 1938, 1945, and 1991. In 2001, there was a single ashy outbreak.
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