GORDIENKO V.V. Distribution of specific elastic energy capacity and viscosity in the tectonosphere of Ukraine

https://doi.org/10.15407/gpimo2025.02.023

V.V. Gordienko, Dr. Sci. (Geol. & Mineral.), Prof., Chief Researcher
e-mail: gordienkovadim39@gmail.com
ORCID 0000-0001-9430-7801
Scopus author Id = 7102473958

S.I. Subbotin Institute of Geophysics of NAS of Ukraine
32, Palladin ave., Kyiv, 03142, Ukraine

DISTRIBUTION OF SPECIFIC ELASTIC ENERGY CAPACITY AND VISCOSITY IN THE TECTONOSPHERE OF UKRAINE

The paper presents a description of the process and the results of constructing the distribution of specific potential elastic energy (W) and dynamic viscosity (h) in the tectonosphere of Ukraine. These characteristics of the medium provide information on the accumulation of stress arising during shear deformations and characterize the medium (the crust and upper mantle of the Earth) from the side of its reaction to applied stresses of different nature. The corresponding calculations became possible after creating three-dimensional models of temperature, velocity of longitudinal seismic waves, and density in Ukraine’s crust and upper mantle at depths of 25—400 km with the author’s participation in previous works. Such a problem was solved for the first time. The methodological basis for determining all

the listed parameters is a scheme of deep processes in the tectonosphere, considering, first of all, the results of heat and mass transfer during recent activation. They are superimposed on platform models (in addition to the territory of the East European platform, Donbass is also in it), the Alpine geosyncline of the Carpathians, and the Hercynian-Cimmerian geosyncline of the Scythian plate. The unfinished process of recent activation cannot be accurately described by the geological theory used by the author. Its optimal version was established before the start of the work by gravitational and thermal modeling along many DSS profiles around the northern hemisphere. For the calculation of W, the initial data were supplemented with information on the strength of the tectonosphere substance depending on temperature. The conditions for the formation of ruptures and earthquakes were considered.

Temperature anomalies do not create the necessary stresses to exceed strength. The uplift of crustal blocks and subcrustal mantle due to overheating has sufficient impact. Seismogenic movements occur at the boundaries of blocks with different rates of rise and slide of rock masses at an angle. This is also noticeable in platform territories with recent activation, such as the Dnieper-Donets Basin. To determine h, we used experimental and computational results that allowed us to consider rock composition,crystal size, temperature, total pressure, melt and fluids, strain rates, vibrations, etc. This made it possible to form a background viscosity distribution in the tectonosphere of the inactivated platform.

Considering the anomalous temperatures, it was possible to determine deviations from the background at different depths under the active regions. It was rather difficult to compare the results with experimental data and determine the actual calculation errors and the procedure for constructing the parameter distribution using isolines. In general, admittedly, the obtained picture reflects, primarily, the actual situation in the study of the viscosity of tectonosphere rocks. It may well change significantly in the future.

Keywords: specific potential elastic energy, recent activation, seismicity, dynamic viscosity of rocks; the effect of temperature, pressure, and the appearance of melting.

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