Bernard Kontny

Unmodelled Effects in the Horizontal Velocity Field Determination: ASG-EUPOS Case Study

Unmodelled Effects in the Horizontal Velocity Field Determination: ASG-EUPOS Case Study Recent space and satellite technologies offer great opportunities to determine crustal movements in the single, global reference frame. The densification of the global network through local area networks leads to increase the resolution of modelled deformations both horizontal and vertical. However, the credibility of the obtained velocity field is limited by several factors associated with unmodelled (or mismodelled) effects at the stage of GNSS data adjustment. Some of them are periodic (the influence of local atmospheric or hydrological impacts), some temporary (natural or anthropogenic seismicity) or related to local influences (snow load or effects associated with the freezing of the ground). This paper presents the usefulness of ASG-EUPOS time series for determination of the regional velocity field. The system has been operating since mid-2008, so the velocities obtained through the processing of 3-year time series are supposed to be reliable. The paper also presents comparison of the velocity determinations to the geological NNR-NUVEL-1A and geodetic APKIM2005 models.

System of Survey, Analysis and Interpretation of Rocky Block Deformations in the Mountains

Degradation of natural environment in the Sudetes mountains manifested, among others, by the destruction of woodlands leads to some secondary processes, such as deformations of rocky blocks, which considered most dangerous because of falling rocks down to the roads. Such phenomena can be prevented provided that the mechanisms generating their development will be known. A significant role in achieving this goal is attributed to geodetic surveys which enable monitoring of deformation processes in time and space.