Effects of ongoing geodynamic processes may be inferred from crustal movements detected by the analysis of repeated (or continuous) geodetic observations. The basic concept is to determine and compare the geometry of a network formed by the geodetic stations at certain epochs. The changes of the network geometry over large time spans (e.g. years) are interpreted as a deformation of the network caused by geodynamic processes underlying the studied area.
To ensure a high reliability in the determination of the network geometry, the geodetic measurements must be processed over the entire time span following strict standards and procedures. The existing geodetic space techniques allow the determination of station positions and velocities with accuracies at the millimetre and the sub-millimetre/year level, respectively.