Electromagnetic Emission Caused by the Fracturing of Piezoelectrics in Rocks

Makarets, M. V.; Koshevaya, S.; Gernets, A.A.

doi:10.1238/physica.regular.065a00268

Cited by 11 publications

(13 citation statements)

References 6 publications

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“…(3) is the source of the EM emission, and it is connected with the mechanical displacement vector U . As our calculations have shown (Makarets et al, 2002), this source is equivalent to the effective transient magnetization vector under the above mentioned conditions. It is possible to analyze three basic cases of fracturing (see Fig.…”

Section: Piezoelectric Mechanism Of Electromagnetic Emissionmentioning

confidence: 75%

“…where D is the electric induction, c is the velocity of light, σ ij , U i are the components of stresses and mechanic displacement, respectively; c ij kl , e ij k , ε ij are the components of the tensors of the elastic constants, the piezoelectric constants, and the dielectric permittivity, respectively (Makarets et al, 2002). Substituting D from the Eqs.…”

Section: Piezoelectric Mechanism Of Electromagnetic Emissionmentioning

confidence: 99%

“…If the crack moves, the displacement vector U depends on the time t and the spatial coordinates r, and S (r, t) =0. The problem for a calculation of the EM emission caused by a moving crack in the quartz has been solved in the first approach by Makarets et al (2002), and the details of the calculation can be found there. The most appropriate distribution of the elastic deformation for the uniformly moving crack, used in our calculations, is given by Gus' and Zozulya (1993).…”

Section: Piezoelectric Mechanism Of Electromagnetic Emissionmentioning

confidence: 99%

See 2 more Smart Citations

Interpretation of the microwave non-thermal radiation of the Moon during impact events

Grimalsky

Berezhnoy

Kotsarenko

et al. 2004

Nat. Hazards Earth Syst. Sci.

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Part of Special Issue "Precursory phenomena, seismic hazard evaluation and seismo-tectonic electromagnetic effects"Abstract. The results of recent observations of the nonthermal electromagnetic (EM) emission at wavelengths of 2.5 cm, 13 cm, and 21 cm are summarized. After strong impacts of meteorites or spacecrafts (Lunar Prospector) with the Moon's surface, the radio emissions in various frequency ranges were recorded. The most distinctive phenomenon is the appearance of quasi-periodic oscillations with amplitudes of 3-10 K during several hours. The mechanism concerning the EM emission from a propagating crack within a piezoactive dielectric medium is considered. The impact may cause the global acoustic oscillations of the Moon. These oscillations lead to the crackening of the Moon's surface. The propagation of a crack within a piezoactive medium is accompanied by the excitation of an alternative current source. It is revealed that the source of the EM emission is the effective transient magnetization that appears in the case of a moving crack in piezoelectrics. The moving crack creates additional non-stationary local mechanical stresses around the apex of the crack, which generate the non-stationary electromagnetic field. For the cracks with a length of 0.1-1 µm, the maximum of the EM emission may be in the 1-10 GHz range.

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Section: Piezoelectric Mechanism Of Electromagnetic Emissionmentioning

confidence: 75%

Section: Piezoelectric Mechanism Of Electromagnetic Emissionmentioning

confidence: 99%

Section: Piezoelectric Mechanism Of Electromagnetic Emissionmentioning

confidence: 99%

See 1 more Smart Citation

Interpretation of the microwave non-thermal radiation of the Moon during impact events

Grimalsky

Berezhnoy

Kotsarenko

et al. 2004

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…We consider a piezoelectric crystal of symmetry 32 under mechanical stresses, which causes the uniform motion of the crack (Makarets et al, 2002). The direction of the crack motion and the orientations of the front of the crack are analyzed as arbitrary, in a relation to the crystal symmetry axes (see Fig.…”

Section: Modeling Of the Electromagnetic Emissionmentioning

confidence: 99%

“…Here P 0 is the mechanical stress (Makarets, 2002). possible to determine the electromagnetic response of the ionosphere due to the current pulse originated in the lithosphere. This problem was solved by Molchanov and Hayakawa (Molchanov et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Spectrum of the seismic-electromagnetic and acoustic waves caused by seismic and volcano activity

Koshevaya

Makarets

Grimalsky

et al. 2005

Nat. Hazards Earth Syst. Sci.

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Part of Special Issue "Precursory phenomena, seismic hazard evaluation and seismo-tectonic electromagnetic effects" Abstract.Modeling of the spectrum of the seismoelectromagnetic and acoustic waves, caused by seismic and volcanic activity, has been done. This spectrum includes the Electromagnetic Emission (EME, due to fracturing piezoelectrics in rocks) and the Acoustic Emission (AE, caused by the excitation and the nonlinear passage of acoustic waves through the Earth's crust, the atmosphere, and the ionosphere). The investigated mechanism of the EME uses the model of fracturing and the crack motion. For its analysis, we consider a piezoelectric crystal under mechanical stresses, which cause the uniform crack motion, and, consequently, in the vicinity of the moving crack also cause non-stationary polarization currents. A possible spectrum of EME has been estimated. The underground fractures produce Very Low (VLF) and Extremely Low Frequency (ELF) acoustic waves, while the acoustic waves at higher frequencies present high losses and, on the Earth's surface, they are quite small and are not registered. The VLF acoustic wave is subject to nonlinearity under passage through the lithosphere that leads to the generation of higher harmonics and also frequency downconversion, namely, increasing the ELF acoustic component on the Earth's surface. In turn, a nonlinear propagation of ELF acoustic wave in the atmosphere and the ionosphere leads to emerging the ultra low frequency (ULF) acoustogravity waves in the ionosphere and possible local excitation of plasma waves.

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Use of ultra-low-frequency electromagnetic emission to monitor stress and failure in coal mines

Wang

Jia

Song

et al. 2014

International Journal of Rock Mechanics and Mining Sciences

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Electromagnetic Emission Caused by the Fracturing of Piezoelectrics in Rocks

Cited by 11 publications

References 6 publications

Interpretation of the microwave non-thermal radiation of the Moon during impact events

Interpretation of the microwave non-thermal radiation of the Moon during impact events

Spectrum of the seismic-electromagnetic and acoustic waves caused by seismic and volcano activity

Use of ultra-low-frequency electromagnetic emission to monitor stress and failure in coal mines

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