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A model of the deformation pattern in the Italian area and its relationship with the national reference frame

  • Satellite Positioning for Geosciences
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The Italian reference frame is materialized by a network of 100 GNSS stations that were adjusted in ETRF2000 at epoch 2008.0: the purpose of this study is to estimate and discuss the deformation field in Italy from that epoch until now, focusing on geodetic and cadastral applications. Istituto Nazionale di Geofisica e Vulcanologia has been continuously monitoring a network of permanent GNSS stations for several years. Our work is based on a specific solution that was estimated in 2013. In this solution, the ITRF2008 coordinates and velocities of 741 stations are published: 653 of them are in Italy and provide a quite dense set for our study. Firstly, the velocities have been transformed from ITRF2008 to ETRF2000. Then, the ETRF2000 horizontal velocities have been spatially analyzed. Actually, Italy seems clearly divided into different sub-regions that move in different directions, but have quite homogeneous internal behaviors. A Bayesian clustering on the horizontal velocities has been implemented to group the stations in sub-regions. The rotation of each sub-region with respect to the mean European motion has been estimated: in each sub-region the spatial covariances of the residual velocities have been analyzed, so to investigate the residual deformation. In a time span of 10 years, the deformation field induced by the slow geodynamics is significant, but can be easily modeled by rigid motions of sub-regions. At the end of the work, the estimated displacements induced by three earthquakes that occurred in August and October in central Italy are analyzed: the effects are significant at the local scale and cannot be easily modeled.

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The velocities and seismic displacements of the GNSS permanent stations used in this study have been provided by Roberto Devoti and Federica Riguzzi of Istituto Nazionale di Geofisica e Vulcanologia.

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Correspondence to Ludovico Biagi.

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Biagi, L., Pertusini, L. A model of the deformation pattern in the Italian area and its relationship with the national reference frame. Rend. Fis. Acc. Lincei 29 (Suppl 1), 59–67 (2018).

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