Electromagnetic Radiation Generated by Acoustic Excitation of Rock Samples

Yavorovich, L. V.; Беспалько, А. А.; Fedotov, P.I.; Baksht, R. B.

doi:10.1515/acgeo-2016-0081

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…During initial loading, increasing the temperature increases the EMR signal intensity as well as frequency but as the sandstone progresses towards the fracture the frequency and intensity of the signals have been found to fluctuate significantly [111], whereas Yavorovich et al have investigated different rock samples (skarn, sandstone and magnetite ore samples) for the EMR emission when these are subjected to acoustic excitation. For the skarn and sandstone samples the EMR signal was found to show a decreasing pattern with increase in the strength of the samples, while no such correlation has been observed for the magnetite ore samples [112]. Trca et al have used a newly developed prototype of EME data logger and have continually recorded the electromagnetic radiation emission in Obir caves (Austria) located at an active tectonic plate Figure 10 Schematic diagram of experimental diagram setup used for uniaxial compression of rocks (used with permission from Elsevier) [104].…”

Section: Rocks and Brittle Materialsmentioning

confidence: 75%

A review on deformation-induced electromagnetic radiation detection: history and current status of the technique

2020

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Development of the deformation monitoring techniques for the infrastructures so as to avoid catastrophic failure and resulting economic/human loss has remained a key interest of scientists and engineers. Among various deformation monitoring techniques utilized and explored by groups of researchers, electromagnetic radiation detection is one of the intriguing techniques which has remained popular in researchers’ community till today. Almost every type of material is being explored and studied by researchers for the electromagnetic emissions when subjected to external loading and/or failure. Experimental and theoretical investigations are demonstrating these emissions to be a suitable candidate for the deformation monitoring, as a failure predictor and to know about the complex phenomenon of fracture. This article presents extensive literature review and a rigorous discussion on the work done in the past several decades regarding the exploration of electromagnetic emissions from a wide variety of materials and the underlying physical mechanisms. Thus, this review is an attempt to highlight main findings, proposed physical mechanisms, prospective applications, future scope and challenges of the electromagnetic emission detection technique.

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Section: Rocks and Brittle Materialsmentioning

confidence: 75%

A review on deformation-induced electromagnetic radiation detection: history and current status of the technique

2020

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“…The generation mechanism of the micro current is also consistent with the electromagnetism theory, that is, it is essentially the directional motion of charge inside the coal-rock, and the quantity of charge and its directional movement direction will directly affect the characteristics of micro current, which has been confirmed by the existing literature. 20 , 33 , 34 However, in the existing literature, researchers have not fully elucidated the source, the direction of motion of the charge forming the micro current, and the reason for its variation, which is not conducive to further analysis of the variation of EMR. As a result, the formation of micro current, the direction of charge directional motion, and the variation of the current are analyzed as follows.…”

Section: Theory and Simulation Methodsmentioning

confidence: 99%

Stress-Electromagnetic Radiation (EMR) Numerical Model and EMR Evolution Law of Composite Coal-Rock under Load

Yang

et al. 2022

ACS Omega

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There is a close relationship between the electromagnetic radiation (EMR) evolution and the stress state during loading of composite coal-rock. In this research, the coal-rock EMR generation mechanism was studied and the stress-EMR numerical model was established. Finite element simulation and experiments were then used to verify their correctness, and EMR characteristics, evolution law, and the corresponding relationship between EMR and coal-rock state were studied in depth. The results show that the deformation cycle of “load compression–deformation release–load compression” occurs at coal-rock internal fractures, which together with friction make the formation of coal-rock alternating weak current sources, resulting in the EMR. In addition, the fracture structure is similar to capacitors with time-varying electric quantity and plate spacing. When the fracture is loaded, it will generate approximately sinusoidal EMR pulses whose amplitude is positively correlated with the degree of coal-rock damage. EMR will be exponentially attenuated and distorted at the medium junction when propagating, which does not affect signal characteristics. Meanwhile, EMR quality within 1.0–2.5 mm outside coal-rock is high, whose change is almost synchronous with source. EMR evolution has stages during loading, whose characteristics are different in each stress stage: In compaction and elastic stages, EMR remains stable for most of the time except for the abrupt change of 1–3 mV/m at the junction. In the yield, coal-rock transitions from elastic to plastic, and both EMR and stress increase rapidly as fracture expands. In the fracture stage, EMR maintains high and produces a peak that is synchronous with the stress. After fracture, they drop and recover to stability. The research results will help improve the basic theory of coal and rock dynamic disasters and provide support for its prediction with multi-information fusion, which will help reduce the adverse impact of coal mine disasters on people’s lives and property.

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“…Sasaoka et al (1998) and Wei et al (2020), after their electrical measurements on granite and other rocks, believed that the PZ effect might be responsible for the EM signal generated from the quartz-bearing rocks when it is stressed or fractured. Yoshida and Ogawa (2004) and Yavorovich et al (2016) measured and analyzed the EM responses of different rocks under acoustic emission stimulations. They held the view that the PZ effect plays an important role in the EM radiation phenomenon of quartz-bearing rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Yoshida and Ogawa (2004) and Yavorovich et al. (2016) measured and analyzed the EM responses of different rocks under acoustic emission stimulations. They held the view that the PZ effect plays an important role in the EM radiation phenomenon of quartz‐bearing rocks.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Electromagnetic Responses to an Earthquake Source Due To the Piezoelectric Effect of ‘∞m’ Symmetry

Zhao,

Gao,

Cheng

et al. 2024

JGR Solid Earth

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It is reported that earthquakes are accompanied by electromagnetic (EM) anomalies. These anomalies are thought to be caused by earthquakes but their generation mechanism is still unclear. The piezoelectric effect has been proposed as a possible mechanism, particularly in quartz‐rich rocks. However, the EM responses to earthquakes due to such an effect have not been well understood. In this article, we study the EM signals generated by an earthquake source due to the piezoelectric effect. We develop a semi‐analytical method to simulate the EM responses to earthquake sources in a 3‐D layered model and conduct numerical simulations to investigate the characteristics of the EM fields. The results show that the piezoelectric effect in quartz‐rich rocks could be the responsible mechanism for the EM signals recorded during the earthquake. Two kinds of EM signals can be generated by the earthquake, namely, the early EM wave arriving before the seismic waves and the coseismic EM field accompanying the seismic waves. For an Mw 6.1 earthquake, the coseismic electric field is ∼0.1 μV/m and the magnetic field can only reach ∼10−5 nT. We also study the sensitivity of the coseismic EM fields to the rock conductivity. The results indicate that the coseismic EM fields are mainly affected by the conductivity of the shallow layer where the receiver is located, and if the top layer is thin, they are also affected by the conductivity of the deeper layer due to the contribution of the evanescent EM wave created at the interface.

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Electromagnetic Radiation Generated by Acoustic Excitation of Rock Samples

Cited by 11 publications

References 24 publications

A review on deformation-induced electromagnetic radiation detection: history and current status of the technique

A review on deformation-induced electromagnetic radiation detection: history and current status of the technique

Stress-Electromagnetic Radiation (EMR) Numerical Model and EMR Evolution Law of Composite Coal-Rock under Load

Numerical Simulation of Electromagnetic Responses to an Earthquake Source Due To the Piezoelectric Effect of ‘∞m’ Symmetry

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