Выпуск: 1 , Том: 57 , Год издания: 2016

This study presents a 3D model of the P and S seismic velocities above the Kamchatkan slab obtained as a result of tomographic inversion of arrival times of body waves from deep seismicity in the subduction zone. Various tests performed have shown limitations of the spatial resolution of the model and provided arguments for the reliability of the major structures used in the interpretation. In the uppermost layer down to 20 km depth, the model reveals strong low-velocity anomalies coinciding with Holocene volcanoes of the Klyuchevskoy group and Kizimen. In the seismogenic zone at depths from 80 to 150 km, we observe a low-velocity anomaly, which probably reflects the presence of the relatively thick oceanic crust sinking together with the subducting slab. This anomaly may also represent a zone of phase transitions, melting, and release of fluids from the slab. In the cross sections, we observe vertical and inclined low-velocity anomalies connecting the slab with the volcanic groups that probably represent the paths of ascending fluids and melts, which feed the volcanoes. In the case of Kizimen, we observe a single conduit connecting the volcano with the slab transformation area at 100 km depth