Perturbation of an external magnetic field by a Rayleigh surface waveстатья
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Дата последнего поиска статьи во внешних источниках: 4 июня 2021 г.
Аннотация:Elastic waves propagating in the earth's crust generate perturbations of the geomagnetic field, which are amenable to measurement. A correlation is observed between the displacement of the earth's surface and the oscillations of the electromagnetic field with respect to the signal arrival time and the frequency [1]. This effect is attributable to the action of currents in the earth's crust, which are induced by the movement of its conducting material in the geomagnetic field. The effect is similar in its nature to the previously investigated [2] action of an acoustic perturbation on the E layer of the ionosphere.In the present article we calculate the induced alternating electromagnetic field from the specified motion of a medium in a surface wave. We investigate various sources of seismic waves: harmonic, line, and point. We analyze the influence of the electrical conductivity of the medium, the source depth, and other parameters on the nature of the electromagnetic signal observed at large distances. We discuss the experimental data [1] in light of our results. The analytical method used here is applicable not only to surface waves, but also to other types of seismic waves.