The rate of the current crustal deformation of active seismic regions, can be estimated through the measurement of tailor made GPS geodetic networks. Data can provide new estimations of the geodetic deformation both at regional and sub regional scale as well as of the single geological structures. Results are used for scientific and Civil Protection applications and for the modelling of the seismic source in case of significant earthquake occurrence. Since 1999 the Istituto Nazionale di Geofisica e Vulcanologia (INGV), in the frame of the project Application of space techniques for the estimation of the crustal deformation and the seismic risk of the central-southern Apennines, funded by the Agenzia Spaziale Italiana (ASI), has planned, set up and repeatedly surveyed the Central...