Electromagnetic monitoring in the region of seismic activization (on the Gorny Altai (Russia) example)

Неведрова, Н Н; Санчаа, А М; Shalaginov, Aleksandr; Babushkin, S. M.

doi:10.1016/j.geog.2019.06.001

Cited by 7 publications

(5 citation statements)

References 16 publications

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“…The present study identifies key points with complex relationships between variations in apparent electrical resistivity and the stress-strain state of crustal parts in order to investigate geodynamic processes in seismically active zones. Slow fluid redistribution between fracture and pore systems during seismic event preparation is also reflected in variations in electric conductivity, as shown in [29].…”

Section: The Monitoring Of Geodynamic Processesmentioning

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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Section: The Monitoring Of Geodynamic Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2023

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“…The results confirmed the need to map changes in the subsurface Another study was conducted in the Gorny Altau Basin, which was affected by the 2003 Mw7.3 Chuya earthquake. Geoelectrical soundings (VES and dipole-dipole arrays) and the transient electromagnetic method (TEM) were used to reconstruct the subsurface resistivity pattern of the study area [61]. Accurate measurements were obtained during the post-seismic period.…”

Section: Resistivity Measurement In Russiamentioning

confidence: 99%

Detecting DC Electrical Resistivity Changes in Seismic Active Areas: State-of-the-Art and Future Directions

Lapenna

2024

Geosciences

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In this paper, a critical review of the geoelectrical monitoring activities carried out in seismically active areas is presented and discussed. The electrical resistivity of rocks is one of the geophysical parameters of greatest interest in the study of possible seismic precursors, and it is strongly influenced by the presence of highly fractured zones with high permeability and fluid levels. The analysis in the present study was carried out on results obtained over the last 50 years in seismic zones in China, Japan, the USA and Russia. These past works made it possible to classify the different monitoring strategies, analyze the theoretical models for interpreting possible correlations between anomalies in resistivity signals and local seismicity, and identify the main scientific and technological gaps in the literature. In addition, great attention has been paid to some recent works on the study of the correlations between focal mechanisms and the shapes of anomalous patterns in resistivity time series. Finally, some future scenarios for the development of new activities in this field have been identified.

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“…The new approach is based on the theory of moving source initiation during internal rock mass cracking due to the stress-strain state of the medium [12]. We use internal interaction as the modern geodynamic process manifestation concept as the main one for the Altai-Sayan mountainous region, Junggar Basin, and Tien Shan [13][14][15]. This greatly corresponds with the ideas from [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 96%

Maintenance process for the joint seismic-and-electromagnetic monitoring in low-ambient noise areas: the seismic gradient system

Непеина

Рыбин²,

Kaznacheev³

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The project of the joint seismic-and-electromagnetic monitoring in low-ambient noise areas is aimed at studying the phenomena associated with the deformation of the Earth’s crust. The arrangements set of the geophysical monitoring in low-ambient noise areas is proposed. The paper describes in detail the technological scheme being of monitoring of the modern geodynamic activity with a magnetotelluric soundings method and a small seismic array presented as the seismic gradient system (SGS). Technical explanations, safety rules, equipment calibration and maintenance, and the technological schemes of the method of obtaining and archiving data are given. Maintenance procedures using SGS with geophones in Tien Shan to determine the endogenous component of the seismic field are described. We investigate a common workflow chart for SGS and main programs for the data caption and data processing. The proposed scheme has been tested and requires the application and adoption to the passive geophysical monitoring routine.

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Electromagnetic monitoring in the region of seismic activization (on the Gorny Altai (Russia) example)

Cited by 7 publications

References 16 publications

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

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

Detecting DC Electrical Resistivity Changes in Seismic Active Areas: State-of-the-Art and Future Directions

Maintenance process for the joint seismic-and-electromagnetic monitoring in low-ambient noise areas: the seismic gradient system

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