Electromagnetic signals produced by elastic waves in the Earth’s crust

Sgrigna, V. and Buzzi, A. and Conti, L. and Guglielmi, A. V. and Pokhotelov, O. A. (2004) Electromagnetic signals produced by elastic waves in the Earth’s crust. Il nuovo cimento C, 27 (2). pp. 115-132. ISSN 1826-9885

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The paper describes the excitation of geoelectromagnetic-field oscillations caused by elastic waves propagating in the Earth’s crust and generated by natural and anthropogenic phenomena, such as earthquakes, explosions, etc. Two mechanisms of electromagnetic signal generation, i.e. induction and electrokinetics ones, are considered and a comparative analysis between them is carried out. The first mechanism is associated with the induction of Foucault currents due to movements of the Earth’s crust in the core geomagnetic field. The second mechanism is connected with movements of liquids filling pores and cracks of rocks. An equation is derived for describing in a uniform way these two manifestations of seismomagnetism. The equation is solved for body and surface waves. The study shows that a magnetic precursor signal is moving in the front of elastic waves.

Item Type: Article
Uncontrolled Keywords: Surface and body waves ; Phenomena related to earthquake prediction ; Geoelectricity; electromagnetic induction and conductivity (magnetotelluric effects)
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia
Depositing User: Marina Spanti
Date Deposited: 14 Mar 2020 10:53
Last Modified: 14 Mar 2020 10:53
URI: http://eprints.bice.rm.cnr.it/id/eprint/15228

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