The 2019 Resumption of Activity on Avachinsky Volcano

The waveforms and spectral content of the earthquakes that were recorded during the period of higher activity on Avachinsky Volcano in 2019 were studied to identify three commonly accepted types of volcanic earthquake (VE), viz., volcano-tectonic, hybrid, and long-period events, as well as a fourth type, a “special” VE type having certain special features in its waveforms. We have identified 15 plane-oriented clusters and determined characteristics of the seismogenic planes. An analysis of the seismic events that were recorded in the fall of 2019 on the Molodoi Konus of Avachinsky Volcano suggests that the resumption of activity was related to the magma bodies due to the 1991 eruption which exist in the cone body and to their interaction with atmospheric precipitation. The most likely cause of light flashes above the crater observed on December 8 seems to have been interaction between hydrogen-charged volcanic gas and air oxygen.