Based on the analysis of the results of instrumental observations, it is shown that the explosion of the volcano caused a series of wave disturbances in the atmosphere, as well as variations in the electric and magnetic fields of the Earth at significant epicentral distances. Atmospheric disturbances were recorded in the form of Lamb waves with a source at the epicenter of the explosion, as well as a virtual source located at the antipode, and the formation of which is associated with the convergence and summation of signals propagating along the Earth's sphere. In addition to the primary waves, secondary and tertiary waves were registered, which were formed as a result of the repeated passage of the signal caused by the explosion around the Earth's sphere. The source energy has been estimated.
Acoustic effects associated with volcanic eruptions are considered. The phenomenological classification of wave disturbances caused by volcanoes in the atmosphere is given. Wave disturbances classes that are characteristic of different types of volcanic activity are discussed. The basic mechanisms for generating low-frequency infrasound waves during large explosive eruptions of explosive type are described. As an example, acoustic effects caused by the eruption of the Stromboli volcano in July ‒ August 2019 are presented and discussed.
It describes new approach to assessment of energy sources of infrasound perturbations by spectrum of fluctuations in atmospheric pressure given stratigraphy of the atmosphere. It offers phenomenological model of spread of infrasound in standard atmosphere based on data of instrumental observations made during studying infrasound signals from powerful explosive atmospheric sources. There has been developed technique for assessment of energy which uses integral dependence of energy on power spectrum. Obtained results are consistent with known researches data.
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