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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

A. M. Sanchaa 1, N. N. Nevedrova 1, N. V. Shtabel 1,2

1 A.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS; 2 Novosibirsk State Technical University; Novosibirsk, Russia

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.

Keywords: Chuya depression of Gornyi Altai, Mukhor-Tarkhata, non-stationary electromagnetic sounding, geoelectric models, earthquake-prone region, three-dimensional mathematical modeling.

DOI 10.20403/2078-0575-2021-2-67-73

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