Advances in Geosciences www.adv-geosci.net 1680-7340 1680-7359 14 2nd EGU Alexander von Humboldt Conference "The role of Geophysics in Natural Disaster Prevention" 2008 10.5194/adgeo-14-25-2008 http://www.adv-geosci.net/14/25/2008/ http://www.adv-geosci.net/14/25/2008/adgeo-14-25-2008.html http://www.adv-geosci.net/14/25/2008/adgeo-14-25-2008.pdf 25 28 2008-01-02 Electromagnetic emission from magnetite plate cracking under seismic processes S. Koshevaya V. Grimalsky N. Makarets A. Kotsarenko J. Siquieros-Alatorre R. Perez-Enriquez D. Juarez-Romero Autonomous University of Morelos, UAEM, Av.Universidad 1001, Col. Chamilpa, Z.P. 62209, Cuernavaca, Mor., Mexico Department of Physics, Kyiv National Shevchenko University, Volodymyrska 64, Kyiv, Z.P. 01033, Ukraine Centro de Geociencias, UNAM, A.P. 1-742, Querétaro, Z.P. 76001, Mexico Electromagnetic emission generated by cracking of a magnetite plate is theoretically investigated. The non-stationary mechanical stresses, produced by moving the tip of a crack and a wave of mechanical unloading in the plate are considered as the sources of the radiation. It is demonstrated that the radiation is produced by the appearance of a non-stationary magnetic moment in the plate. Biadzhi, P. F., Gershenzon, N. I., Zilpimiani, D. O., Mandzhgaladze, P. V., Pokhotelov, O. A., Sgrin'ya, V., and Chelidze, Z. T.: Influence of a magnetic field on mechanical properties of ionic crystals during their deformation, Sov. Phys. Solid State, 32(8), 1352–1354, 1990. Gernets, A. A., Makarets, M. V., and Koshevaya, S. V.: Electromagnetic Emission Caused by the Fracturing of Piezoelectrics, Phys. Scripta, 65, 268–272, 2002. Gershenzon, N. I., Zilpimiani, D. O., Mandzhgaladze, P. V., and Pokhotelov, O. A.: Electromagnetic radiation emitted by the apex of a crack during failure in LiF crystals, Doklady AN SSSR (Sov. Phys. – Doklady), 228(1), 75–78, 1986. Gilder, S. A., LeGoff, M., Chervin, J., and Peyronneau, J.: Magnetic properties of single and multi-domain magnetite under pressures from 0 to 6 GPa, Geophys. Res. Lett., 31(10), L10612, doi:10.1029/2004GL019844, 2004. Hayakawa, M. and Molchanov, O.A (Eds.): Seismo Electromagnetics, Lithosphere-Atmosphere-Ionosphere coupling, Terrapub, Tokyo, 2004. Huang, J. H. and Kuo, W. S.: The analysis of piezoelectric/piezomagnetic composite materials containing ellipsoidal inclusions, J. Appl. Phys., 81(3), 1378–1386, 1997. Landau, L. D. and Lifshitz, E. M.: Electrodynamics of Continuous Media, Nauka, Moscow, 1982. Landau, L. D. and Lifshitz, E. M.: Classical Theory of Fields, Nauka, Moscow, 1967. Pan, E.: Exact Solution for Simply Supported and Multilayered Magneto-Electro-Elastic Plates, ASME, J. Appl. Mech., 68(4), 608–618, 2001. Petrov, N. and Brankov Y.: Modern Problems of thermodynamics, Mir, Moscow, 1986. Unger, D. J.: Analytical Fracture Mechanics, Dover Publ. Inc., Mineola, N.Y., 2001. Vainshtein, B. K.: Modern Crystallography, 4, Nauka, Moscow, 1982. Wang, B. W. and Mai, Y. W.: Fracture of piezoelectromagnetic materials, Mechan. Research Commun., 31(1), 65–74, 2004.