Abstract
The results of instrumental observations of acoustic oscillations, geomagnetic variations, and variations in the electric field and atmospheric electric current during the activation of the Stromboli volcano, Italy, in 2019 are presented. Separately considered are the periods of explosive activity and the interval marked by intense emission of incandescent ash-and-gas mixture. It is shown that volcanic activity is accompanied by acoustic signal generation at the explosive stages of the eruption and by the emergence of internal gravity waves at the stage of intense effusion of ash and gas (“purging”). The characteristic variations in the Earth’s magnetic field and in the electrical parameters of the atmospheric surface layer are observed during different periods of volcanic eruption. The presented results expand the existing database and can be useful for improving the existing models and developing the new models describing the effect of volcanic activity on the geophysical environment as well as for verifying these models.
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Notes
Coordinate axes directions: the x- and y-axes are oriented in the N–S and E–W directions, respectively, and the z-axis points vertically downwards.
Oscillations with periods of 6–15 min are identified with the fundamental mode of the internal gravity waves (IGW) at the cushion height of the convective region of the heating products above the source, i.e., by the oscillations about the level of thermal equilibrium. This mechanism of IGW generation by the penetrative convection is implemented in the presence of a highly unstable (overheated) layer of the atmosphere (Gossard and Hook, 1975).
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This research was carried out in partial fulfillment of the state contract of the Sadovsky Institute of Geosphere Dynamics of the Russian Academy of Sciences (state registration number of the research project AAAA-A19-119021890067-0, project ID 0146-2019-0009).
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Spivak, A.A., Rybnov, Y.S., Riabova, S.A. et al. Acoustic, Magnetic, and Electric Effects of Stromboli Volcano Eruption, Italy, in July–August 2019. Izv., Phys. Solid Earth 56, 708–720 (2020). https://doi.org/10.1134/S1069351320050122
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DOI: https://doi.org/10.1134/S1069351320050122