L'attuale quadro cinematico italiano dedotto da osservazioni GNSS

The present Italian kinematic field has been estimated by a network of about 780 GNSS permanent stations. The daily observations acquired with a sampling rate of 30 seconds from January 01, 2001 to December, 31, 2015 have been analysed through the GAMIT/GLOBK software, adopting a distributed procedure. The position component time series (North, East and Vertical) are analysed in order to obtain a reliable estimation of: average velocity, amplitude and periods of seasonal signals, dimension of instrumental and/or seismic steps and noise. These characteristics have been studied in order to verify possible correlations with some characteristics of GNSS installation and/or natural and anthropogenic phenomena present in some areas. The average velocity of the 414 sites characterized by a time span greater than 2.5 years and an efficiency greater than 50% have been used in order to estimate the present kinematic pattern in the Italian peninsula and surrounding areas. The horizontal velocity field is characterized by some interesting features that are compatible with the long term deformation pattern deduced from geological observations. The vertical velocity field is characterized to an heterogeneous distribution probably due to the strong influence that anthropogenic activities have on this component .