VARIATIONS OF GEOPHYSICAL FIELDS DURING THE TONGA VOLCANIC ERUPTION BY THE DATA OF THE LARGE-SCALE RESEARCH FACILITY «MIKHNEVO»
Sadovsky Institute of Geospheres Dynamics, Russian Academy of Sciences
Journal: Geophysical processes and biosphere
Keywords: large-scale research facility «Mikhnevo», interaction of geospheres, Tonga volcano, atmospheric-ionospheric waves, geomagnetic waves, Schuman resonance, hydrogeological responses.
Аnnotation: The paper considers the results of registration of geophysical field variations by the large-scale re-search facilities «Mikhnevo» of Sadovsky Institute of Geospheres Dynamics of Russian Academy of Sciences caused by catastrophic Tonga volcanic eruption in the period from December 19, 2021 to January 18, 2022. Atmospheric-ionospheric waves associated with the Tonga volcanic activity were source of global geomagnetic disturbances. An independent estimate of the eruption time and propagation velocity of electromagnetic disturbances was made based on synchronous measure-ments of Schumann resonance signals, atmospheric pressure, and geomagnetic field variations. The background data obtained during the observation period December, 2021 – January, 2022 were compared with the results of registration of Tonga volcanic eruption and two passages of Lamb's surface wave around the Earth. The ranges of atmospheric pressure variations and the amplitudes of hydrogeological responses of the weakly confined and confined aquifers have been determined. Experimental data obtained by the large-scale research facilities «Mikhnevo» confirm the relation-ship between different geospheres and add the global database of geophysical parameters recorded at different epicentral distances from catastrophic events.