Systematic Methodology for Velocity-dependent Gravity Modelling of Density Crustal Cross-Sections, using an Optimization Procedure |
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| Authors: | Lech Krysiński |
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| Institution: | (1) Institute of Geophysics, University of Warsaw, ul. Pasteura 7, 02-093 Warsaw, Poland |
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| Abstract: | The paper describes a new method of gravity modelling of the density cross section along a DSS profile. We propose a systematic
procedure of gravity interpretation using structural information contained both in the velocity distribution of the seismic
model and the geometry of its layers. The procedure is based on the optimisation of the density parameters of the model. The
values of the parameters are limited by relationships between the seismic velocity and the density (optimisation with inequalities).
The formulation of the method allows for discussion of the presence of isostasy and the distribution of compensating masses.
The discussion is very important for the considered crust-lithosphere system. The presented calculations are done for one
Carpathian profile (CEL01). The analysis of the properties of the fitting procedure provides the characteristic depth of subcrustal
compensating density structures, the position of crucial tectonic boundaries along the profiles, locations of the crustal
areas having exceptional lithology, the regional density differences of subcrustal matter and the estimation of regional deviations
from the isostatic equilibrium. |
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| Keywords: | Gravity modelling optimisation with inequalities isostasy density boundary Carpathians |
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