scholarly journals Electromagnetic research in the Altai-Sayan mountain region

2021 ◽  
Vol 3 (2) ◽  
pp. 7-19
Author(s):  
Sergei Babushkin ◽  
Nina Nevedrova ◽  
Viktor Seleznev ◽  
Aleksei Liseikin
Keyword(s):  
Deep Structure ◽  
Three Dimensional ◽  
Sampling Step ◽  
Electromagnetic Sounding ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Electromagnetic Soundings ◽  
Time Domain Electromagnetic ◽  
The Time Domain ◽  
Sayan Mountain

A new software-measuring complex has been developed for recording non-stationary electromagnetic soundings based on mobile modules created on the basis of 24-bit ADCs, with built-in GPS receivers, with recorders located directly at the field sensors, arithmetic sampling step and recording of all signal realizations. The deep structure of the Uimon depression in Gorny Altai has been studied based on the time-domain electromagnetic sounding. Research is relevant due to the high seismic hazard of the area, and is also in demand for prospecting and exploration of predicted minerals here. To construct geoelectric models, data from several years of measurements were used, during which more than 60 soundings were performed. At this stage, the interpretation was performed using computer systems within the framework of a horizontally layered model. The interpretation results are presented in the form of sections and threedimensional visualizations, which clearly reflect the structure of the depression. Further, three-dimensional modeling and additional measurements are planned to verify and refine the results obtained.

DEEP STRUCTURE OF THE FAULT ZONE IN THE MUKHOR-TARKATA SITE OF THE CHUYA DEPRESSION ACCORDING TO NON-STATIONARY ELECTROMAGNETIC SOUNDING DATA USING THREE-DIMENSIONAL MODELING

2021 ◽  
pp. 67-73
Author(s):  
A. M. Sanchaa ◽  
◽  
N. N. Nevedrova ◽  
N. V. Shtabel ◽  
◽  
...  
Keyword(s):  
Fault Zone ◽  
Time Domain ◽  
Deep Structure ◽  
Near Field ◽  
Three Dimensional ◽  
Structural Features ◽  
Electromagnetic Sounding ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Time Domain Electromagnetic

The paper presents the results of three-dimensional modeling of the fault structure in the central part of the Chuya depression in Gornyi Altai within the Mukhor-Tarkhata plot. On this site, from 2004 to the present, researchers of the IPGG SB RAS have been conducting regular annual observations by the method of nearfield time-domain electromagnetic sounding (TSB) to observe the process of restoration of the geological environment after the catastrophic Chuya earthquake with a magnitude of 7.3 in 2003. One of the aftereffects of the destructive earthquake is fracture zones expressed on the surface. Numerous deformations of the surface and industrial objects are observed in the area of the Mukhor-Tarkhata village. The fault zone with sub-vertical fracturing, identified at the site by geological and electromagnetic data, was activated after the earthquake. Detailed data on the geoelectric structure are required for the interpretation and analysis of monitoring data. Based on the interpretation of the near-field time-domain electromagnetic sounding data, the deep structure of the fault zone was obtained. To verify and clarify structural features of the geoelectric model, three-dimensional modeling was performed.

scholarly journals SIMULATION OF ELECTROMAGNETIC SOUNDING SIGNALS FROM THE ARCTIC ICE SURFACE

2019 ◽  
Vol 2 (2) ◽  
pp. 116-123
Author(s):  
Polina Osipova ◽  
Vladimir Mogilatov ◽  
Arkadiy Zlobinskiy
Keyword(s):  
Born Approximation ◽  
Three Dimensional ◽  
Arctic Region ◽  
The Arctic ◽  
Electromagnetic Sounding ◽  
Three Dimensional Modeling ◽  
Ice Surface ◽  
Dimensional Modeling ◽  
Arctic Ice ◽  
The Arctic Region

Electromagnetic sounding of the Arctic region is hampered by the influence of the conductive layer of seawater. As part of the RSF project, it is proposed to use a circular electrical dipole (CED) to excite the field. Installation should be placed on drifting ice. This technique requires three-dimensional modeling for which there are complex algorithms. The paper proposes an approach using the Born approximation to simplify the implementation of three-dimensional modeling of the electromagnetic sounding signal using CED.

scholarly journals Significance of Electromagnetic Surveys at Active Volcanoes: Toward Evaluating the Imminence of Wet Eruptions

2019 ◽  
Vol 14 (4) ◽  
pp. 580-591 ◽  
Author(s):  
Takeshi Hashimoto ◽  
Wataru Kanda ◽  
Yuichi Morita ◽  
Midori Hayakawa ◽  
Ryo Tanaka ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Volcanic Eruptions ◽  
Monitoring Networks ◽  
Resistivity Structure ◽  
Geophysical Monitoring ◽  
Electromagnetic Sounding ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Volcanic Fields ◽  
Subsurface Resistivity

The detection capability of various anomalous phenomena preceding volcanic eruptions has considerably progressed as the geophysical monitoring networks have become denser and multi-disciplinary. However, current eruption forecasting techniques, from a practical perspective, still have much scope for improvement because they largely depend on empirical techniques. In the past decade, three-dimensional modeling based on the electromagnetic sounding methods such as magnetotellurics (MT) have become a practical choice, and its recent applications to active volcanic fields has revealed certain common features among volcanoes. Information about the resistivity structure, especially in ‘wet’ volcanic fields, is useful for the provisional screening of the eruption potential from the viewpoint of the subsurface structure, and, thus, may contribute to the evaluation of eruption imminence in a broad sense. In this study, for evaluation purposes, we present the roles and possible further applications of the subsurface resistivity structure studies by demonstrating the preliminary results and interpretations of an MT survey that we performed in the Kuttara Volcanic Group, northern Japan.

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