Based on the study of the waveforms and spectral composition of earthquakes recorded during the activation of Avachinsky volcano in 2019, three generally accepted types of volcanic earthquakes (VE) were identified: volcano-tectonic, hybrid and long-period, as well as the fourth – a “special” type of VE, characterized by differ of waveforms. 15 plane-oriented clusters have been identified and the characteristics of seismogenic areas
have been determined. Analysis of the seismic events recorded in autumn 2019 in the Young Cone of Avachinsky Volcano suggested a connection between the activation of the 1991 eruption in the body of the cone and their interaction with atmospheric precipitation with magmatic bodies. The most likely cause of the light flashes over the crater on December 8 is the interaction of a hydrogen-rich volcanic gas in contact with atmospheric oxygen.

Seismic activation of Avachinsky volcano was observed from late October to late December 2019, when 6 swarm sequences of volcanic earthquakes of various types occurred in its construction. In the swarm sequences, 15 plane-oriented clusters were identified and the characteristics of their seismogenic areas were determined. A comprehensive analysis of seismic events indicates that the activation of Avachinsky volcano at the end of 2019 arose because of the interaction of meteoric waters with magmatic bodies in the body of the cone, which arose during an effusive eruption in 1991.