Determination of energy parameters of seismic events of the Transcarpathian trough taking into account the quality factor of the Earth’s crust

Abstract

Transcarpathia is characterized by significant differences in the structure and geodynamics of the lithosphere in comparison with other seismically active regions of Ukraine, which causes a number of features of the seismotectonic process of this region. The spatial distribution of the seismicity of the Transcarpathian Depression is closely related to the fault-block structure of the foundation. Important characteristics of the seismic process in Transcarpathia are the energy parameters of local earthquakes — magnitude, intensity, energy class. It is these values that form the basis of seismic zoning. The methods used to determine the energy parameters of local earthquakes do not fully take into account the effects of hypocenter depths and regional features of seismic wave propagation paths. Thus, the issue of determining the quantitative indicators of the quality factor of the Earth’s crust of the studied region and the development of approaches to determining the calibration function for estimating local magnitudes is relevant. The article presents the results of the study, which are aimed at determining the calibration function for calculating the energy characteristics of earthquakes in the Transcarpathian Depression, taking into account the parameters of attenuation of the Earth’s crust. Using digital records of seismic signals from the Transcarpathian Depression, obtained on the elements of the Ukrainian seismic group, as well as seismic stations «Stone Bridge», «Pidluby», «Zelenytsia» and «Lyubar» were determined quantitative indicators of the quality of the Earth’s crust and developed approaches to determination of the calibration function for estimation of local magnitude and its check on real signals.