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HIGHLIGHTING THE DEEP TECTONIC ELEMENTS OF THE EASTERN CARPATHIANS BY ANALYZING THE MORPHOLOGY OF GEOID
Abstract
The separation between the mobile plate (Phanerozoic) in south and west of the eastern European Precambrian East European Craton is the most prominent geological limit in Europe known as the Trans-European Suture Zone (TESZ) In this study we were mainly interested in a prominent segment of TESZ, known as the Tornquist -Teisseyre Area (TTZ). In this study we highlighted the TTZ area through the gradient of geoid from Romania. The geoid provides a good representation of the long wavelength characteristics of the Earth's gravitational field. Short wavelength characteristics are less prominent in the geoid. These are more obvious in the maps of gravity acceleration. Although gravity acceleration, depending on position, can be deduced from satellite average data, this data does not solve well the short wavelengths. Short wavelength terms are best determined from observations of gravity at the surface. To use the gravity observed, to find out more about the interior of the Earth, we eliminate the effects of the non-spherical surface of the Earth. This means that we perform the gravity corrections observed based on the topographic surface. Starting from the regional gravity anomalies, according to the Vening-Meinesz theory, isostatic compensation is performed both in the vertical direction and in the lateral directions, going from the local to the regional framework, due to the elasticity of the Lithosphere. The lateral isostatic compensation region of mass loading (or mass deficit) can be defined by a region of radius R, in which significant lateral stresses occur. We used special software programs for calculating geodetic and gravimetric parameters, accredited by the International Gravimetric Bureau (BGI), were accessed using the Python interface. Using the fftgeoid program in the software package GravSoft, we calculated the geoid corrugations based on gravity anomalies using the Stokes integral. We calculated in two ways using both the plane approximation and the spherical approximation through the Fast Fourier Transform 1D and 2D. In our paper we presented the results, obtained on the basis of data processing, graphical examples and their tectonic interpretation.
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