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Changes in sizes of the Klyuchevskaya volcanic group's glaciers had been estimated for the period from 1949–1950 to 2010–2015 using results of analysis of current satellite imagery, data of field observations and historic records. Changes in front positions for some glaciers were analyzed for different periods of time. According to results of comparison between our data and similar ones from the Glacier Inventory the glacier areas decreased by 0.7%. Calculations made with corrected data demonstrated the total increase of the glaciation area by 4.3%. Glaciation of the Klyuchevskoy volcano is characterized by dynamic instability and significant changeability. The Erman glacier, the largest one in this region, did constantly advance since 1945. In 1949‑2015, its area at the front increased by 4.96±0.39 km2, while the front advanced along the valley of the Sukhaya River by approximately 3675±15 m and by 3480±20 m along the valley of the Krutenkaya River. A number of «wandering glaciers» located on the North‑Eastern and Eastern slopes of the volcano, on the contrary, significantly reduced their areas. At the same time, formation of new flows of ice is noticed within the «ice belt». Under the influence of active volcanic processes, the configuration of glacier boundaries on the slopes of Klyuchevskoy volcano does actively change in not only the tongue areas but also in the accumulation areas. Changes in dynamics of the glaciation areas of the Klyuchevskaya group of volcanoes don’t correspond to the present‑day climate changes. The interaction of modern volcanism and glaciation in the area as a whole is conducive to the preservation and development of glaciers, despite the deterioration of climatic conditions of their existence.

Fluctuations of glaciers of the Klyuchevskaya group of volcanoes in the 20th –21st centuries