The Murman-2018 Experiment on Remote Sensing in Order to Study the “Impenetrability” Boundary at the Transition between Brittle and Plastic States of the Crystalline Earth’s Crust

Жамалетдинов, А. А.; Velikhov, E. P.; Shevtsov, A. N.; Skorokhodov, A. A.; Колобов, В. В.; Ivonin, V. V.; Kolesnikov, Vladimir

doi:10.1134/s1028334x19050301

Cited by 9 publications

(3 citation statements)

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“…The hypothesis of fluid redistribution between fracture systems of different orientations [21,38,102,103] is accepted as a working hypothesis to explain variations in apparent resistivity associated with changes in the stress-strain state of geological objects. The closure or opening of fluid-filled end-to-end pore networks (cracks) leads to changes in the electromagnetic characteristics of the media, anomalous values in geophysical fields, and the appearance of rock with anisotropic properties [104].…”

Section: Discussion: Reasons For Variability In Macro Anisotropic Par...mentioning

confidence: 99%

“…These factors include lunar-solar tides, fluid dynamics, tectonic processes, and anthropogenic impacts on the lithosphere, leading to changes in the stress-strain state of the geological media [18]. Observation systems with controlled sources of electromagnetic fields are employed, including methods of magnetotelluric sounding of the Earth [19][20][21], which provides information on the physicoelectric (electromagnetic, magnetochemical, physicochemical, etc.) parameters of the lithosphere.…”

Section: Introductionmentioning

confidence: 99%

“…Research on electrical parameters and related phenomena in geodynamically active zones is being conducted worldwide [24][25][26][27], including seismically hazardous regions such as Altai [28][29][30], Tien Shan [31][32][33][34], Kamchatka [35,36], and Kola [21,37]. The results of these studies indicate a correlation between changes in electrical resistivity and geodynamic processes occurring in deep layers of the Earth's crust.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Monitoring of Modern Geodynamic Processes: An Approach for Micro-Inhomogeneous Rock through Effective Parameters

2023

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This study focuses on microscale anisotropy in rock structure and texture, exploring its influence on the macro anisotropic electromagnetic parameters of the geological media, specifically electric conductivity (σ), relative permittivity (ε), and magnetic permeability (μ). The novelty of this research lies in the advancement of geophysical monitoring methods for calculating cross properties through the estimation of effective parameters—a kind of integral macroscopic characteristic of media mostly used for composite materials with inclusions. To achieve this, we approximate real geological media with layered bianisotropic media, employing the effective media approximation (EMA) averaging technique to simplify the retrieval of the effective electromagnetic parameters (e.g., apparent resistivity–inversely proportional to electrical conductivity). Additionally, we investigate the correlation between effective electromagnetic parameters and geodynamic processes, which is supported by the experimental data obtained during monitoring studies in the Tien Shan region. The observed decrease and increase in apparent electrical resistivity values of ρk over time in orthogonal azimuths leads to further ρk deviations of up to 80%. We demonstrate that transitioning to another coordinate system is equivalent to considering gradient anisotropic media. Building upon the developed method, we derive the effective electric conductivity tensor for gradient anisotropic media by modeling the process of fracturing in a rock mass. Research findings validate the concept that continuous electromagnetic monitoring can aid in identifying natural geodynamic disasters based on variations in integral macroscopic parameters such as electrical conductivity. The geodynamic processes are closely related to seismicity and stress regimes with provided constraints. Therefore, disasters such as earthquakes are damaging and seismically hazardous.

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