Browse

The possible effect of the reductions to the measured distances between the points in a geodynamic geodetic network on the reliability of the subsequently calculated deformations has been analyzed. Experimental investigations on the basis of doubly measured spatial chords from the real network and their analogues in UTM-projection have been planned and implemented. Reduction adjustments have been indisputably found to lead to distortion of the deformation model.

Two models have been proposed – static and kinematic – for modelling of the contemporary vertical crustal movements. Herein are demonstrated: the mathematical mechanism, the experimental investigations, the analysis of the results and some graphical representations. Based on the modelling, the relevant conclusions have been drawn.

A specific application of the Method of the finite elements is proposed. The approach is based on the theory about the rheological segmentation of the Earth crust. Different practical various of the proposed method are considered

Theoretical and experimental investigations have been made to study the polar motion based on the IERS (International Earth Rotation Service) solution. A set of 9 mathematical models is proposed to examine the time series of polar motion. We have proved by statistical tests that the ARMA (2,1) model is the “best” one of the proposed set of competing models. Estimates have been obtained of the spectral characteristics by investigating the cyclic polar motion variations. Criteria are applied to assess the adequa...

In the region of Botanical Garden, BAS, Sofia, gravimetry measurements for research of the landslide processes with static gravimeter LaCoste \& Romberg G1059 are made in two epochs - 2003 and 2005. In the present paper the method of measuring, processing and analysis of the results is presented. Digital models of Bouguer anomaly, direction of gradient on Bouguer anomaly and 3D presentation of surfaces of Bouguer anomaly between two epochs are made. Conclusions about the landslide state are drawn on the basis of t...

Existing conditions, aims and tasks of investigation and geodetic methods is described. Obtained displacements for the period 1966-2004 are analyzed. Corresponding conclusions are drawn.

A method for landslide investigation, based on the deformations-theory and on the finite elements method, is proposed. The practical application of the method for a real object – the landslide near Orsoja is shown. The main priorities of the deformation analysis in comparison with the mass applicated in the practice moving observation are shown.