General trends of normal height changes in Czechoslovakia for a period of approximately 33 years

Abstract

Abstract Comparison of the results of height adjustments on the International Repeated Levelling Network in Czechoslovakia with the normal heights from the first international adjustment affords information about general trends of height changes in the period of approx. 1943–1976 (mean epochs of both levelling). Negative changes of the heights (subsidences) occured over practically the whole county, amounting to about 70 mm in south Moravia and south-west Slovakia. Also the height changes determined from independent adjustments of the network in Czechoslovakia at the same epoch was studied. This was based on the premise of unchanging height of the Lisv fundamental levelling benchmark in south Bohemia. As the result, we got practically the same courses of the isolines of identical height changes, only systematically shifted by about 60 mm. The data of comparison should be the subject of interpretation from the point of view of structural geology for which they can serve as a basis for studying fundamental tendencies of the dynamics of the Earth's crust in the investigated region and for given time period.