The three-dimensional geoelectric model of earth crust and upper mantle of the Dobrudga region
Journal Title: Геодинаміка - Year 2015, Vol 18, Issue 1
Abstract
Purpose. The purpose of researches is to build a three-dimensional geoelectric model of the crust and upper mantle and to answer some questions of the deep structure and geodynamics of the North Dobrudga and PeriDobrudga depression. Methodology. The methodology includes a detailed analysis of the deep structure of the region based on the results of 3D modeling of electromagnetic experimental data and to search for the interrelation between conductivity anomalies in the Earth’s crust and upper mantle and foci of seismic events. Results. Anomalies of high electric conductivity from the surface of the Earth crust to the upper mantle are identified. Stretched for hundreds of kilometers conductors are associated with deep conductive fractures of different fractures: Frunze, Saratsky, Bolgrad, Cahul-Izmail, Chadyrlungsk and others. A highly conductive layer is identified on the southern side of PeriDobrudga depression which lies at the depth corresponding to the lower crust and the top part of upper mantle. North side of PeriDobrudga depression is characterized by the distribution of electrical conductivity in the upper mantle which is the same as that of EEP, while presence of conductive structure at the depths of 110 to 160 km differs the southern slope from the northern one. Earthquake sources as well as anomalies of high electric conductivity are mainly correlated with active deep tectonic fractures and juncture zones of geological structures such as different age zones of Precambrian EEP and Cimmerian Scythian plate on the territory of PeriDobrudga depression and North Dobrudga. Originality. Three-dimensional deep geoelectric model built on experimental results of modern MTS and MVP data reflects inhomogeneous distribution of electric conductivity in the depth on the territory of PeriDobrudga depression and North Dobrudga. Practical significance. The results will make it possible to estimate more reliably the peculiarities of seismic hazard for the Dobrudga region of Ukraine and certain seismically active zones and structures.
Authors and Affiliations
T. Burakhovych, A. M. Kushnir, I. Yu. Nikolaiev, B. I. Shurkov
Keywords
Related Articles
- EP ID EP455929
- DOI 10.23939/jgd2015.01.055
- Views 91
- Downloads 0
Evaluation of three-dimensional deformation fields of the Earth by methods of the projective differential geometry. The main linear deformations
Aim. The aim is to solve the problem of evaluating the Earth’s topographic surface deformations using projective differential geometry methods as an expression of the space metric tensor and the group of main linear defo...
On the Interdepartmental tectonic committee of Ukraine
Information on the tasks, the composition of participants, the principles and directions of activity of reconstituted in 2017 the Interdepartmental Tectonic Committee of Ukraine is presented.
Structure, dynamics and seismotectonics of faulting zones (by results of physical modelling and field studies) parth 1: physical modelling
Purpose. The aim of the work is to present and to analyze the results of physical modeling and field studies of processes of formation, evolution and modern geodynamic and seismotectonic activity of subvertical shear zon...
Lithogenetic aspects of oil and gas systems formation in the Volyno-Podolia Silurian deposits
Objective. To elucidate the dynamics of catagenetic processes that occurred in the Silurian sediments against the background of an oil and gas systems formation. Method. The method includes lithology-facies, mineralogica...
Marmarosh massif in Ukraine and holy cross mountains in Poland – the rootless allochthonous tectonic structures
Objective: The objective of this study is the investigation of the geological structure of the unique Holy Cross Mountains, located at the territory of Poland and also the unique area of the Marmarosh Massif in Ukraine,...