Geomagnetic perturbations in a stratified medium, caused by propagation of a longitudinal spherical waveстатья
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Статья опубликована в журнале из перечня ВАК
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Дата последнего поиска статьи во внешних источниках: 4 июня 2021 г.
Аннотация:Acoustic wave propagation in the Earth leads to perturbations in the geomagnetic field [1-3]. The study of electromagnetic signals provides additional information on both the seismic source and the rock state (in particular, its electrical conductivity). In theoretical studies one consideres magnetic perturbations due to Rayleigh surface waves having the highest amplitude at large distances from the source [4-7]. Thus, in [5] was investigated a quasi-harmonic Rayleigh wave in an external magnetic field, and in [6] - perturbations due to surface waves initiated by linear and point sources.
In the present study we calculate magnetic perturbations near a source of longitudinal spherical waves for any reduced potential function of elastic displacements. We investigate the various mechanisms of appearance of an electromagnetic signal. We analyze the effect of diffusion of the genereated currents, and single out the term describing local magnetic perturbations near the elastic wave front.