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Possibilities of Using the Method of Median Gradients to Reveal Changes in Apparent Electrical Resistivity during the Nucleation of Earthquakes

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Abstract

Changes in apparent electrical resistivity are calculated using one of the electrical survey methods—the median gradient—over the earthquake nucleation area in the shape of a sphere. Changes in the specific electrical resistivity of rocks in the source region of the earthquake nucleation are estimated taking into account the published estimates of changes in strain and strain-sensitivity coefficients. We consider the models where the sphere-shaped inclusion has a constant size in time and its electrical conductivity and depth of occurrence increase. Also considered is a model where the depth of the sphere is constant and the resistivity of the rocks in it decreases. A model is presented in which the size of the inhomogeneity increases with a simultaneous decrease in the electrical resistivity of rocks in it and the further localization of the decrease in a smaller volume, which corresponds to the ideas of tightening the nucleation zone of the main rupture into a narrow zone. According to this model, the graphs of changes in apparent resistivity return to background values shortly before the earthquake, i.e., changes in apparent resistivity over time will have the shape of a bay. A comparison of changes in electrical resistivity according to this model with variations in the resistivity of rocks at the Ashgabat Geodynamic Survey site, as well as limestone samples under laboratory conditions during their deformation and destruction, show their qualitative similarity and the possibility of using the results of laboratory tests of samples for modeling and analyzing the process of earthquake nucleation.

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Funding

This work was supported by the State Task of the Institute of Physics of the Earth, Russian Academy of Sciences, “Geophysical Fields of Middle Latitudes: Monitoring and Modeling” (state registration number АААА-А17-117040610184-3).

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123995, Moscow, Russia

    V. S. Zhukov

  2. Borok Geophysical Observatory, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 152742, Borok, Yaroslavl Oblast, Russia

    A. O. Mostryukov

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  1. V. S. Zhukov
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Correspondence to V. S. Zhukov.

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Zhukov, V.S., Mostryukov, A.O. Possibilities of Using the Method of Median Gradients to Reveal Changes in Apparent Electrical Resistivity during the Nucleation of Earthquakes. Izv. Atmos. Ocean. Phys. 58, 925–935 (2022). https://doi.org/10.1134/S0001433822080084

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