Magmatic activity of Klyuchevskoy volcano triggering eruptions of Bezymianny volcano based on seismological and petrological data

Abstract

The Frac-Digger method based on seismological data of the Kamchatka Branch Federal Research Center United Geophysical Survey Russia Academy of Sciences (KB FRC UGS RAS) was applied to reveal the 3D distribution and chronology of injections of dykes and sills from the deep and shallow magma chambers of Klyuchevskoy volcano preceding the eruptions of Bezymianny volcano during period from 2000 to 2020. The orientation of magma injections (dykes and sills) and mechanisms of volcano-tectonic earthquakes reveal radial horizontal extensional stress conditions in volcanic structures and sometimes local radial compression around magma chambers. Geochemical history of eruption samples shows the parentage of Klyuchevskoy magma for Bezymianny volcano products, tracing magma transport patterns. The result is a 3D conceptual model of the magma-feeding system of Bezymianny volcano from Klyuchevskoy volcano.