ИСТИНА

We considered features of the formation of volcanic debris flows (lahars), on the basis of our field research in 2008, interpretation of satellite images, and analysis of literature on volcanic eruptions of Klyuchevskoy and Shiveluch volcanoes in Kamchatka Peninsula, Russia. We reconstructed the chronology of volcano-induced debris flows at these volcanoes over the last decades and have compiled a map of debris flow formation conditions for the eastern sector of the Klyuchevskoy Volcano. We focused particular attention on the formation of the water component of volcano-induced debris flows. Mechanisms of lahar initiation as a result of glacial processes and of snow melting on volcanoes have been highlighted. We interpreted satellite images and made 19 sketch maps and database on lahars in Kamchatka. Also we analysed granulometric composition of lahar deposits.