Horizontal deformations on the border of the Bohemian massif as determined by repeated edm measurements

Abstract

In order to study the relative motions between the Bohemian Massif and the Carpathians, special geodetic networks of vertical as well as horizontal measurements were established during the 70s. The first results of repeated measurements analysis were discussed in contributions presented at international symposia in Curych, 1974 and Palo Alto, 1977. The last repeated measurements in horizontal networks were analysed and are presented in the contribution. The results of repeated distance measurements are transformed in the field of deformations and the main axis and measure of stress-strain deformation is determined. Using this kind of analysis the former results on the spreading tendencies between both geological systems are confirmed. The deformations occur in the tectonically significant zones, in particular the Lednice zone (northern part of the Vienna basin). The results on surface deformations are discussed in relation to the deep structure of the area under study, since the main deformations are connected with the area of strong subsidence of Bohemian Massif under the Carpathians. The results are compared with the others obtained using geodetic as well as in situ measurements within the territory of central Europe.