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Three-Dimensional Inversion of Magnetotelluric Data in Studying the Source Zones of the Earthquakes in the Altai–Sayan Region

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A three-dimensional (3D) inversion of the components of magnetotelluric impedance matrix is used for constructing a geoelectric model of the Altai-Sayan region. Based on the model and empirical data, the possibilities of three-dimensional inversion of all the four components of the impedance matrix and its invariant values ​​are studied. The model values ​​of the impedance matrices obtained by solving the inverse problem by interactive fitting the 3D model invariant curves of apparent electrical resistivity to the experimental curves for the central part of the Altai–Sayan region were used as the test data. The high conductivity anomalies obtained by 3D inversion are correlated with the locations of earthquake sources, deep faults, domains of increased attenuation of the converted waves from the earthquakes, and low velocities of P-waves in the deep seismic sounding and earthquake converted waves methods.

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  1. Kadurin V.A., Belyavsky V.V., Egorkin, A.V. et al. “Geophysical investigations by seismic and electrical exploration methods of the deep structure of the Altai-Sayan folded region along the profiles with a total length of 3300 km. Organization and implementation of regime geophysical observations at the Tyvinsk test site.” 2008 Rosgeolfond No. 492 309. State Federal Unitary Enterprise “All-Russian Research Institute Geophysical Methods of Exploration.” Funds of the Ministry of Natural Resources of the Russian Federation.

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ACKNOWLEDGMENTS

The authors are grateful to the staff of Krasnoyarsk Research Institute of Geology and Mineral Resources and the All-Russian Research Institute of Geophysical Exploration Methods, who have performed MT and seismic field observations in the Altai-Sayan region and processed the data obtained, as well as Doctor of Geological and Mineralogical Sciences Pavel Yurievich Pushkarev—for the assistance in the WSINV3DMT program package adaptation (Pushkarev, 2017).

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  1. Geoelectromagnetic Research Centre, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 142190, Troitsk, Moscow, Russia

    V. V. Belyavsky & I. N. Lozovsky

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  1. V. V. Belyavsky
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Correspondence to V. V. Belyavsky or I. N. Lozovsky.

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Belyavsky, V.V., Lozovsky, I.N. Three-Dimensional Inversion of Magnetotelluric Data in Studying the Source Zones of the Earthquakes in the Altai–Sayan Region. Izv., Phys. Solid Earth 56, 511–529 (2020). https://doi.org/10.1134/S1069351320040035

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