Stress–Strain State Monitoring of the Geological Medium Based on The Multi-instrumental Measurements in Boreholes: Experience of Research at the Petropavlovsk-Kamchatskii Geodynamic Testing Site (Kamchatka, Russia)

Gavrilov, V. A.; Panteleev, Ivan; Deshcherevskii, A. V.; Ландер, А. В.; Morozova, Yu. V.; Buss, Yu. Yu.; Vlasov, Yu. A.

doi:10.1007/s00024-019-02311-3

Cited by 12 publications

(4 citation statements)

References 24 publications

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“…Techniques for earthquake monitoring and forecast have some new developments. A long-term study at the Petropavlovsk-Kamchatskii Geodynamical Test Site (Russia) provides the results of the continuous monitoring of the stress-strain state based on borehole geo-acoustic measurements and electromagnetic measurements with underground electric antennas (Gavrilov et al 2019). Combined with hydro-geochemical and hydro-geodynamic borehole measurements, these methods allow monitoring the changes in the parameters of geological environment and identifying the changes of its stress-strain state.…”

Section: Theoretical Discussion and Innovative Methods Proposed/discumentioning

confidence: 99%

Continental Earthquakes: Physics, Simulation, and Data Science—Introduction

Zhang

Goebel

et al. 2019

Pure Appl. Geophys.

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During May 12-14, 2018, the International Conference for the Decade Memory of the Wenchuan Earthquake, in connection to the 4th International Conference on Continental Earthquakes (4th ICCE) and the 12th General Assembly of the Asian Seismological Commission (ASC), was held in Chengdu, China. There have been several outcomes of the Conference (for example, the book published jointly by Higher Education Press and Springer) as well as the present special issue. Among the 58 submissions, 34 have been accepted after peer review. Some of the papers came from the presentations during the Conference, but with additional submissions, the scope of this special issue is far beyond that of the proceedings of the meeting.

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Section: Theoretical Discussion and Innovative Methods Proposed/discumentioning

confidence: 99%

Continental Earthquakes: Physics, Simulation, and Data Science—Introduction

Zhang

Goebel

et al. 2019

Pure Appl. Geophys.

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“…The basic measurements are continuous geoacoustic measurements at depths up to 1012 m and electromagnetic measurements with underground electric antennas. The basis of geoacoustic methods for monitoring the stress-strain state of the geoenvironment is the effect of modulation of the GAE amplitude by an alternating electric field, discovered during long-term complex borehole measurements at the PGP [6,[15][16][17][18]. The method of continuous monitoring of the stress-strain state of the geoenvironment, based on measurement data with underground electric antennas, makes it possible to monitor changes in the resistivity of the geoenvironment in the area of the well to a depth of about 2200 m [6].…”

Section: Boreholes Measurements 31 Petropavlovsk-kamchatskiy Geodynamentioning

confidence: 99%

“…Another important property of multiparameter monitoring is the synchronization in time and space of the appearance of all atmospheric and ionospheric precursors, which is typical for synergetic processes in open dissipative systems [5], which is a complex of generation of earthquake precursors at the final stage of their preparation. In turn, as shown in [6], the preparation of strong S earthquakes (S=L/R h *100%), where L is the linear size of the earthquake source approximated by an ellipse; R h is the hypocentral distance), as a rule , begins to manifest itself in the data of borehole measurements at the Petropavlovsk-Kamchatskiy geodynamic test site (PGP) on a medium-term scale of time (months, years before the earthquake). A sufficiently accurate determination against the background of these processes of the beginning of the stage immediately preceding the earthquake (weeks, days before the moment of the main event), at the present stage of research, causes great difficulties and, in a short-term forecast, leads, as a rule, to unacceptably large values of the "alarming time".…”

Section: Introductionmentioning

confidence: 99%

Responses to the preparation of strong Kamchatka earth-quakes in the lithosphere–atmosphere–ionosphere system, based on new data from integrated ground and iono-spheric monitoring

et al. 2020

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The experience of short-term forecasting of Kamchatka earthquakes based on complex well measurements at the Petropavlovsk-Kamchatsky geody-namic polygon (PGP) shows that, as a rule, the preparation of strong Kamchatka earthquakes is fairly reliable in the medium-term time scale (months or years be-fore the earthquake). However the determination of the stage beginning imme-diately preceding an earthquake (weeks or days before the main event) is a very difficult task. At present time, the solution of this problem is largely associated with the involvement in the preparation of forecast conclusions of data from continuous monitoring of the ionosphere, carried out by ground-based means of vertical radiosonding and measurements of total electronic content (TEC) using the global navigation satellite system GLONASS and GPS. This is due to the fact that significant changes in a number of ionospheric parameters occur mainly 1-5 days before the Kamchatka earthquakes. The results of the compar-ison of the data of daily monitoring of the ionosphere, including information on TEC, with the data integrated downhole measurements showed a rather high correlation of occurrence of anomalies in the ionosphere before strong earth-quakes with changes in the complex parameters in borehole measurements. As one example, the report presents the results of ionospheric and borehole monitoring obtained in the time neighborhood of the strong (MW = 7.5) the earth-quake that occurred on March 25, 2020 in the area of the Northern Kurils. The results show a high correlation between changes in the specific electrical resis-tivity of the Geospace in the area of the PGP with variations in the TEC and the formation of a number of other anomalies in the ionosphere a few days be-fore the earthquake. These results indicate that it is possible to determine fairly reliably the beginning of the final stage of preparation for a strong earthquake. Currently, methods based on atmospheric parameters monitoring are used quite successfully for predictive estimates of the epicenter and magnitude of an earth-quake: the method of chemical potential corrections for measurements at an altitude of ∼ 100 m, as well as data from measurements of outgoing long-wave infrared radiation (OLR) at the level of the upper edge of clouds (heights of 10 -15 km).

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“…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%

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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Stress–Strain State Monitoring of the Geological Medium Based on The Multi-instrumental Measurements in Boreholes: Experience of Research at the Petropavlovsk-Kamchatskii Geodynamic Testing Site (Kamchatka, Russia)

Cited by 12 publications

References 24 publications

Continental Earthquakes: Physics, Simulation, and Data Science—Introduction

Continental Earthquakes: Physics, Simulation, and Data Science—Introduction

Responses to the preparation of strong Kamchatka earth-quakes in the lithosphere–atmosphere–ionosphere system, based on new data from integrated ground and iono-spheric monitoring

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

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