The introduction of elements of geographic information technologies in the process of interpretation of gravity anomalies led to the possibility of constructing three-dimensional density models every detail of the earth's crust. These models meet the criteria of Hadamard. The results obtained allowed to identify new and confirm the previously known patterns.
The modern concept of the deep structure of the crust of Onega structure and its surroundings is given based on analysis of available geological and geophysical data and the drilling record for the Onega parametric borehole obtained in the past fifty years. The deep structure of the Earth’s crust of this territory was studied in more detail and its composition, possible geological nature and geodynamic setting were assessed more accurately by summing up and interpreting of geological, tectonic, geophysical and mineralogenic data.
In the article the results of studies of stress-strained state of the crust in Chatkal`s mountain zone of west Tan-Shan are shown. In the first approximation the main and paleo-stresses for separate area of the region`s are estimated. For analysis of the stresses the methods of mathematical modeling and tectonophysical methods of stresses fields reconstructions and method of recovering of stresses by earthquakes mechanisms are used.
In the resent years fragmentary crustal low velocity zones were revealed by DSS profiles at depths of 3-25 km around the Earth. In most cases they are considered as thermodynamical phenomena rather than a result of changing composition when mineral material is transformed by pressure and temperature at the depth of their occurrence. Multimethod laboratory studies of sample show that under PT conditions at 5-15 km depths rocks are subjected to cataclastic and dilatational changes.
Purpose. The purpose of the research is to study the features of the tectonic stress field before and after the 2011 Japan earthquake. Methodology. The reconstruction of the tectonic stress field is carried out on the basis of cataclastic analysis method of earthquake focal mechanism. The method allows us to define the tectonic stress tensor parameters and increments of quasi-plastic deformation. Results.
This paper presents two-dimensional numerical models of the thermal structure of the crust and upper mantle in the Carpathians region based on new seismic data along the profile Dobre-3 (PANKACE) from East European Craton to Pannonian basin (PB). Heat flow and temperature distribution in the crust can be explained by lithosphere structure and Cenozoic tectonic and magmatic activity.
Purpose. Identify patterns in position earthquake hypocenters relative density stratification in the borders of the earth's crust. Methods. The methods of the new interpretative gravity anomalies by interpreting the gravity field is determined by the power of the earth's crust, forming the anomaly in the gravity field (Bouguer). In this border area forms a surface that separates two sector of the earth's crust. In its upper part, in the sector above the fixed surface, observed density change substance at the transition from one block to another in the horizontal direction.
Purpose. To investigate the structure of the upper crust of the Onega Peninsula by microseismic sensing. Methods. The technique involves a comprehensive analysis of detailed geological structures areas Onega Peninsula based on diagrams of the intensity distribution along the profile microseisms and depth, reflecting the relative velosity change properties of the medium obtained in the sample measurement acording the microseismic sounding method (MSM). Results. The results of sounding structure of the crust background micro-seismic two profiles within the Onega Peninsula.
Purpose. Using new data on the deep structure of the crust and upper mantle and on paleogeodynamics, resulting from complex interpretation, a model of platectonic development of the transition zone northern coast of the Sea of Okhotsk – Eurasia was developed. To show the role of terrains in the development of Okhotsk microplate paleosubduction, appearance of Okhotsk-Chukchi volcanogenic belt and its latter closing.
Purpose. The aim of the research is to estimate parameters for seismic dislocations, for example of strong earthquakes in the Turan platform and adjacent mountainous part of Western Tien-Shan, as well as identifying the relationship between the magnitudes and lengths of breaks for pleistoseist zones. Methodology.