Energy-4 Generator for Monitoring Seismically Active Regions and Electromagnetic Sounding of the Earth’s Crust. Experience of Application in the Kovdor-2015 Experiment

2018 ◽  
Vol 54 (3) ◽  
pp. 268-280 ◽  
Author(s):  
V. V. Kolobov ◽  
M. B. Barannik ◽  
B. V. Efimov ◽  
A. A. Zhamaletdinov ◽  
A. N. Shevtsov ◽  
...  
Keyword(s):  
Active Regions ◽  
Earth’S Crust ◽  
Electromagnetic Sounding ◽  
Earth's Crust

scholarly journals System for Collecting, Processing, Visualization, and Storage of the MT-Monitoring Data

Data ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 99 ◽  
Author(s):  
Elena Bataleva ◽  
Anatoly Rybin ◽  
Vitalii Matiukov
Keyword(s):  
Practical Importance ◽  
Active Regions ◽  
Tien Shan ◽  
Earth’S Crust ◽  
Management Tool ◽  
Research Station ◽  
Depth Range ◽  
Integrated Monitoring ◽  
Geodynamic Processes ◽  
Earth's Crust

On the basis of the Research Station of the Russian Academy of Sciences in Bishkek, a unique scientific infrastructure—a complex geophysical station—is successfully functioning, realizing a monitoring of geodynamic processes, which includes research on the network of points of seismological, geodesic, and electromagnetic observations on the territory of the Bishkek Geodynamic Proving Ground located in the seismically active zone of the Northern Tien Shan. The scientific and practical importance of monitoring the geodynamical activity of the Earth’s crust takes place not only in seismically active regions, but also in the areas of the location of particularly important objects, mining, and hazardous industries. Therefore, it seems highly relevant to create new software and hardware to study geodynamic processes in the earth’s crust of seismically active zones, based on integrated monitoring of the geological environment in the widest possible depth range. The use of modern information technology in such studies provides an effective data management tool. The considering system for collecting, processing, and storing monitoring electromagnetic data of the Bishkek geodynamic proving ground can help overcome the scarcity of experimental data in the field of Earth sciences.

Pulsed MHD generators and deep electromagnetic sounding of the earth's crust

1978 ◽  
Vol 44 (3) ◽  
pp. 235-242 ◽  
Author(s):  
I. D. Morokhov ◽  
E. P. Velikhov ◽  
Yu. M. Volkov
Keyword(s):  
Earth’S Crust ◽  
Electromagnetic Sounding ◽  
Earth's Crust

scholarly journals THE CURRENT STRESS OF EARTH'S CRUST IN THE TERRITORY OF UZBEKISTAN ACCORDING TO FOCAL EARTHQUAKE MECHANISMS

2021 ◽  
Vol 12 (3) ◽  
pp. 435-454
Author(s):  
T. L. Ibragimova ◽  
R. S. Ibragimov ◽  
M. A. Mirzaev ◽  
Yu. L. Rebetsky
Keyword(s):  
Active Regions ◽  
Earth’S Crust ◽  
Stress Fields ◽  
Shear Stresses ◽  
Internet Resource ◽  
Homogeneous Sample ◽  
Current Stress ◽  
Minimum Number ◽  
Different Depths ◽  
Earth's Crust

The current stress of Earth's crust in the territory of Uzbekistan has been studied using a focal earthquake mechanisms catalogue that includes the data provided by many authors. Stress reconstructions are based on the cataclastic analysis of displacements along fractures. For reconstructing the stress state at different depths of the crust in several seismically active regions of the study area, we consider a minimum number of earthquakes in a homogeneous sample equal to 6 and an averaging radius of 10 to 30 km within a single domain. The azimuths and dip angles of the principal stress axes, Lode – Nadai coefficients, geodynamic types of stress modes, relative (normalized to rock strength) values of maximum shear stresses, and effective pressure values are determined. Maps showing the spatial distribution of the studied parameters are constructed for both the entire seismically active layer and the depth layers. Stress fields are reconstructed and compared at two hierarchical levels based on the parameters of focal mechanisms of weak and moderate earthquakes (М≤4.5) and those of strong (М≥5.0) earthquakes. "Tectonic Stresses of Eurasia", the Internet resource created by IPE RAS, is used to visualize the stress field reconstructed from the data on strong (М≥5.0) earthquakes.

scholarly journals Determination of energy parameters of seismic events of the Transcarpathian trough taking into account the quality factor of the Earth’s crust

2021 ◽  
Vol 43 (2) ◽  
pp. 218-226
Author(s):  
Yu.A. Andrushchenko ◽  
V.I. Osadchy ◽  
O.I. Lyashchuk ◽  
I.V. Kornienko ◽  
M.I. Halabuda
Keyword(s):  
Quality Factor ◽  
Active Regions ◽  
Seismic Wave Propagation ◽  
Earth’S Crust ◽  
Calibration Function ◽  
Energy Parameters ◽  
Local Earthquakes ◽  
Earth's Crust ◽  
Quantitative Indicators

Transcarpathia is characterized by significant differences in the structure and geodynamics of the lithosphere in comparison with other seismically active regions of Ukraine, which causes a number of features of the seismotectonic process of this region. The spatial distribution of the seismicity of the Transcarpathian Depression is closely related to the fault-block structure of the foundation. Important characteristics of the seismic process in Transcarpathia are the energy parameters of local earthquakes — magnitude, intensity, energy class. It is these values that form the basis of seismic zoning. The methods used to determine the energy parameters of local earthquakes do not fully take into account the effects of hypocenter depths and regional features of seismic wave propagation paths. Thus, the issue of determining the quantitative indicators of the quality factor of the Earth’s crust of the studied region and the development of approaches to determining the calibration function for estimating local magnitudes is relevant. The article presents the results of the study, which are aimed at determining the calibration function for calculating the energy characteristics of earthquakes in the Transcarpathian Depression, taking into account the parameters of attenuation of the Earth’s crust. Using digital records of seismic signals from the Transcarpathian Depression, obtained on the elements of the Ukrainian seismic group, as well as seismic stations «Stone Bridge», «Pidluby», «Zelenytsia» and «Lyubar» were determined quantitative indicators of the quality of the Earth’s crust and developed approaches to determination of the calibration function for estimation of local magnitude and its check on real signals.

scholarly journals The Murman-2018 experiment on remote sensing in order to study the boundary of “impenetrability” at the transition between the brittle and plastic states of the crystalline earth's crust

2019 ◽  
Vol 486 (3) ◽  
pp. 359-364
Author(s):  
A. A. Zhamaletdinov ◽  
E. P. Velikhov ◽  
A. N. Shevtsov ◽  
A. A. Skorokhodov ◽  
V. V. Kolobov ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Direct Current ◽  
Earth’S Crust ◽  
Plastic State ◽  
Electromagnetic Sounding ◽  
Magnetotelluric Soundings ◽  
Brittle Ductile Transition ◽  
Electric Dipoles ◽  
Earth's Crust ◽  
First Time

The article describes the experiment “Murman-2018” on remote electromagnetic sounding in combination with frequency and audio magnetotelluric soundings. The current from 29 kW power car-generator was fed into the ground using two mutually orthogonal grounded electric dipoles 1.6 and 1.9 km long. The measurements were carried out along three traces with maximum distances from the source up to 105 km in the mode of frequency sounding (in the range of 4-1000 Hz) and up to 56 km in the mode of remote sensing at direct current. The data processing was performed in the spectral mode and in the accumulation mode. The results of the experiment made it possible to quantify for the first time in the scientific literature the position of the boundary of a sharp increase in rock resistance at a depth of 10-15 km. The nature of the established boundary (the boundary of the “impenetrability” for direct current) is associated with the transition of the properties of the rocks of the Earth's crust from the fragile state in the upper crust to a plastic state at depths of 10-15 km and more. In foreign literature, this boundary is defined as the BDT-zone (brittle-ductile transition zone).

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