scholarly journals RELATION OF THE MORPHOSTRUCTURE OF THE CREST POSITION OF THE VORONEZH ANTECLISE WITH THE DEEP INHOMOGENEITIES OF THE LITHOSPHERE

Author(s):  
I. T. Ezhova ◽  
L. I. Nadezhka ◽  
A. I. Tregub

The morphostructure of an crest part of the Voronezh anteclise is closely related to the neotectonics of the territory. A feature of the newest structure, in contrast to the Paleozoic, Mesozoic and Paleogene structures, is predominantly the submeridional orientation of the interchanging raised and downdip blocks. The following regularities of the degree of the reflection of the deep inhomogeneities in neotectonic and geomorphological characteristics have been revealed. The zones of the reduced density at the top of the mantle have been noted to be corresponded in general by neotectonic blocks with the elevated relief. Areas of the high density values in a number of cases are corresponded by the Neogene-Quaternary blocks of the second rank with the reduced values of relief depth marks. Both of the relationships of the thickness of the earth’s crust and the height of the relief, negative and straight, have been observed. A complete spatial correlation between these parameters has been not observed, but on the whole, the structural plan of the Neogene-Quaternary structural-material complex is consistent with the spatial location of large heterogeneities in the litho sphere.

Author(s):  
O. Chalyi ◽  
M. Diaconescu ◽  
I. Gurova ◽  
Y. Lisovyi ◽  
P. Pigylevsky ◽  
...  

In the article, the earthquake near Sumy is considered in detail. According to the authors, this earthquake occurred under the influence of several stress regimes. At the regional level: it is related to the transfer of stresses from the Vrancea zone along the mantle lineament of Sollogub; a change in the local stress field, which is created by blocks with different thicknesses of the earth's crust, with the presence of subcrustal thermal anomalies. The area of the location of the earthquake focus near the town of Sumy in tectonic terms is on the southwestern slope of the Voronezh crystalline massif near the northeastern side of the Dnieper-Donets Basin (DDB). The epicenter is confined to the northern extension of the Krivyy-Rig-Kremenchug suture zone. The earthquake focus is confined to the tectonic node formed by the eastern edge fault of the Krivyy-Rig-Kremenchug suture zone and the northern side fracture of the DDB. The main deep faults near the source of the earthquake are the northern side fault of the DDB rift and the northern extension of the Krivyy Rig-Kremenchug fault. The hypocenter of the event is in the area with sharp change in the structural plan of the Moho surface accompanied by a negative mantle gravitational anomaly. In the relief of the Moho surface, a superimposition of the structural plan of the northwestern direction, connected with the Devonian rift of the DDV, on the ancient structural plan of the Ukrainian shield and Voronezh crystalline massive is clearly visible. Within the DDV, the isohypses of the Moho surface clearly delineate the ascent to ~ 35 km in the central part of the rift. The Krivyy-Rig-Kremenchug suture zone is expressed in the Moho surface by a narrow elongated depression with depths of more than 50 km in the central part. Here, in the lower part of the cortex, the development of the crust-mantle mixture is observed. The Krivyy-Rig-Kremenchug suture zone is also distinguished by the development of high-intensity deep magnetic inhomogeneities along it. In addition, here in the lower part of the crust and in the upper mantle a linear object of high electrical conductivity is isolated. Thus, the earth's crust of the region has a pronounced physic-geological heterogeneity, which creates instability of lithostatic stress, and this, in turn, is a prerequisite for the appearance of additional stresses.


1915 ◽  
Vol 79 (2058supp) ◽  
pp. 382-383
Author(s):  
Alphonse Berget

2017 ◽  
Vol S36 ◽  
pp. 3-10
Author(s):  
P. G. Dyadkov ◽  
◽  
L. V. Tsibizov ◽  
M. P. Kozlova ◽  
A. V. Levicheva ◽  
...  

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