Geoelectric Model of the Central Part of the Northern Caucasus and Its Fluid Saturation

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Izvestiya, Physics of the Solid Earth Pub Date : 2023-08-06 DOI:10.1134/S1069351323040018

V. V. Belyavsky

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Abstract—A series of magnetotelluric and seismic studies have been carried out on profiles covering more than two thousand kilometers within the North Caucasus region. The earlier interpretation of the magnetotelluric observations by means of one– and two–dimensional inversion and three–dimensional mathematical modeling software has helped to construct a series of sections and models which are viewed as test and starting ones for the construction of a three–dimensional geoelectric model of the region. The test models have been used to test how well the software for three–dimensional inversion of the impedance tensor components in the magnetotelluric sounding method can estimate the parameters of conducting blocks in the structures of the Greater Caucasus and the Scythian plate. In the resulting geoelectric model, constructed from the results of three–dimensional inversion of all impedance tensor components, the position of low–resistance blocks correlates with deep faults, volcanoes of various genesis, and seismically active zones characterized by the reduced velocity of seismic waves and their increased absorption. The electrical resistivity of low–resistance anomalies is explained by the degree of their saturation with the fluid water fraction. Its maximum concentration is found within the intersections of fault systems, flexural–rupture zones, and deep faults activated by tectonic processes.

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北高加索中部地电模式及其流体饱和度

摘要:在北高加索地区两千多公里的剖面上开展了一系列大地电磁和地震研究。早期利用一、二维反演和三维数学建模软件对大地电磁观测资料进行解释，建立了一系列剖面和模型，作为建立该地区三维地电模型的试验和起点。试验模型用于检验大地电磁测深方法中阻抗张量分量三维反演软件对大高加索和斯基泰板块构造中导电块体参数的估计效果。在所有阻抗张量分量的三维反演结果构建的地电模型中，低阻块体的位置与深断裂、各种成因的火山以及以地震波速度降低和吸收增加为特征的地震活动区相关。低阻异常的电阻率可以用其与流体水的饱和度来解释。它最集中在断裂系统、弯曲破裂带和由构造过程激活的深断层的交叉处。

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来源期刊

Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理

CiteScore

1.60

自引率

30.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.