Variability of glaciers situated in volcanic regions of Kamchatka is considered. Glacier fluctuations, induced by climatic changes and volcanic activity are distinguished. Kozelsky Glacier advanced in 1971-1976. For five years it made a 330-meter advance and its area increased by 0.09 km . The advance was stimulated by favourable climatic conditions: big snowness of winters and cold summer ablation seasons. The Bil'chenok Glacier advanced in 1976-1977 after a 17-year quiescence period. The glacier terminus descended down to 1100 m a.s.l. and made a 500-m advance. The impact of present-day volcanism on glacier fluctuations was revealed: 1) glacier surges resulting from considerable water film at the glacier-bed boundary, accumulation of
additional volumes of eruptive material on its surface and also due to the growth of seismic activity; 2) shrinkage of the area and volume of glaciers -because of ice melting and washout of their parts by melt waters under thermal influence of erupting volcano and, in particular, in case of subglacial eruptions and ice contacts with lava flows; 3) destruction of ice and glaciers by catastrophic explosive eruptions and also in case of partial subsidence and stopong of volcanoes. Some examples of the impacts of volcanic eruptions on glaciers are given.

Среди разнообразных явлений природы вулканическая деятельность во все времена особо привлекала внимание человека. Мощные, величественные, порой мрачные, иногда грозные, но всегда прекрасные, а в древности мало или совсем непонятные картины вулканических извержений производили на людей всегда сильное впечатление. И неудивительно поэтому, что деятельность вулканов вызывала в человеке, с одной стороны, безотчетную тревогу, а с другой — поэтическое восхищение.
Люди различно воспринимают деятельность вулканов. Одни видят в них величественные и грозные явления природы, другие интересуются ими с точки зрения внешней красоты проявления внутренних сил земли, третьих поражает мощь вулканических сил, а четвертые стремятся разобраться во всех вулканических явлениях и выявить причины их— познать их.

The Klyuchevskaya volcanic group of Kamchatka is unique in many respects: it includes 13 volcanoes, four of which are active; Klyuchevskoy volcano is the youngest and the most active of Kamchatka; the contrast (basaltic and andesitic) volcanism is observed within the relatively small area of this group. This work provides a general scheme of principal fault zones in the area of the Klyuchevskaya volcanic group superimposed on satellite data of middle and high resolution (MODIS, SRTM, ASTER, Landsat, Meteor-M, Kanopus-B and the others). The scheme of the fault zones was created on the basis of the analysis of a set of various published materials and numerous satellite data of different resolution, as well as on the author’s studies of the Klyuchevskaya group volcanoes. All faults at the scheme were well expressed in all examined satellite images. It is shown that the faults ever formed here are long-lived and their activity is associated with certain stages of the evolution of the Klyuchevskaya volcanic group. The formation of all volcanoes of this group mainly happens owing to faults of the northwest, northeast and west-northwest directions. For example, the current activity of Klyuchevskoy volcano is associated probably with the northwest and northeast striking faults; right-hand downthrow-upheaval movements along the faults of the north-northeast directions are likely to have led at different times to the collapse of the eastern parts of the volcanoes Ostry Tolbachik and Kamen.