ИСТИНА

The dynamics of volcanic activity, the magmatic feeding system, the accumulation and migration of magmas, the structure of the roots of volcanoes are the main problems of volcano research. The Northern Group of Volcanoes (NGV) is the most powerful active group located in the north of Kamchatka and includes such active volcanoes as Klyuchevskoy, Krestovsky, Ushkovsky, Bezemyanniy and Ploskii Tolbachik. In the north, Shiveluch also belongs to this group. Studies of the structure of the Klyuchevskaya group were carried out by various geophysical methods, including the methods of the DSS. The main boundaries in the crust and mantle were obtained. The "inverted wave" method, developed by Slavina, Pivovarova, made it possible to follow the change in velocity over time in depth, to restore velocities in the concentration region of volcanic earthquake foci. Earthquakes occurring in the volcanically active region bear information about the path of magmas moving, the state of matter in the geological environment, reflect the spatio-temporal changes in the environment, and its stress-strain state. Seismic activity at the level of weak regional earthquakes carries information about the activation of a particular area of the volcanic region, the preparation of the eruption. Tracking the travel times of P- and S-waves recorded at stations and the ratio of the velocities of these waves, the parameter Vp / Vs gives information on the state and composition of matter in the geological medium, on the ways of moving magmas, and on the tectonic structure of the medium, and state of the medium of intermediate and peripheral volcanic foci. This work was carried out with the financial support of the grant of the President of the Russian Federation for the support of scientific schools No. SS 5545.2018.5.