GEOPHYSICAL FIELDS VARIATIONS DURING THE ERUPTION OF THE HUNGA-TONGA- HUNGA-HAAPAI VOLCANO ON JANUARY 15, 2022

Abstract

The data of instrumental observations performed at the Center for Geophysical Monitoring of Moscow, IDG RAS during the explosive eruption of the Hunga-Tonga-Hunga-Haapai volcano on January 15, 2022, are presented. It is shown that the volcanic explosion caused a series of wave disturbances in the atmosphere. Acoustic-gravity waves were recorded as Lamb waves with a source at the epicenter of the explosion. It is shown that the periods of acoustic-gravity waves passage were accompanied by synchronous disturbances not only of the electric field strength, but also of the concentration of microparticles. The characteristic frequencies of these perturbations closely match to the frequency range including the Brunt–Väisälä frequency.