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Authors: Devoti, R.* 
Esposito, A.* 
Pietrantonio, G.* 
Pisani, A.R.* 
Riguzzi, F.* 
Title: GPS Positioning and Velocity Field in the Apennines Subduction Zone
Issue Date: 4-Oct-2011
Keywords: GPS processing, reference systems, crustal deformation
Subject Classification04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations 
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy 
Abstract: A stable geodetic reference frame permits to relate one position to another and to compute a reliable deformation field from geodetic observations. In order to satisfy scientific requirements, the reference frame should be accurate, reliable and internally consistent over time with unambiguously specified datum definition (origin, scale, orientation and their respective time evolution). Current reference frame stability between successive frame realizations suggests that the agreement is at the level of 1 cm and 0.3 mm/yr respectively for absolute and time derivative translation and scale factors. They represent the current stability over time of the reference frame and set the sensitivity for geodetic measurements. Here we will present the results of a GPS deformation field in the Italian region obtained from all the available permanent GPS stations operated in Italy. The complex nature of the ongoing tectonic deformation along the Alpine-Apennines orogenic systems is now evident and GPS data have proven its capability to measure millimetre scale deformations.
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