Glacial balance observations and the information of meteorological network were used to reconstruct a long-term mass balance of Kozelsky and Grechishkin glaciers (Avachinsky volcanic group and mountains Ostraya and Khuvkhoytun). The mean annual balance of both glaciers is negative and equals 30 and 38 g/cra , respectively, for the last 40 years. From the beginning of the sixties favourable climatic conditions for glacial development of Kamchatka were observed, which caused the transgression of Kozelsky glacier in 1972-76 and the deceleration of degradation rate of Grechishkin glacier.
Besides that the regime of the crater glaciers of Mutnovsky volcano was examined (analysed). The accumulation of solid precipitation reaches here 3000 mm per year. The measured mass balance of North-eastern and Southwestern glaciers in 1980 were 29 and 23 g/cm2 respectively. Presently, this volcano is active and has a positively influence on the crater glacier regime. The area of crater glaciation has increased by 0.4 km2 or 17% since the major eruption in 1945.