GNGTS 2016 - Atti del 35° Convegno Nazionale

GNGTS 2016 S essione 1.2 209 by levelling campaigns performed by the Istituto Geografico Militare Italiano (I.G.M.I.) for about 130 years, along routes covering the national territory (D’Anastasio et al. , 2006) and by more recent GNSS studies (e.g, Serpelloni et al., 2013; Devoti et al., 2011, 2014). The uplift of the Apennines is consistent with the effects expected from the longitudinal shortening of the belt suggested by some authors (e.g., Mantovani et al., 2009, 2015a, 2015b; Viti et al. , 2015a, 2015b). The vertical kinematic pattern in the Venetian and Po plains showed in figure 3 seems to indicate that the subsidence pattern is constant or in some cases, decreasing with respect to the values obtained with different observation time spans and/or techniques (e.g. Arca and Beretta, 1985; Baldi et al., 2009, 2011; Cenni et al., 2013; Teatini et al., 2012). Moderate uplift with values lower than 2 mm/year are observed in the GNSS stations located on the Calabrian Arc and Sicily region. The Sardinia vertical pattern shows a heterogeneous vertical kinematic patter (Fig. 3) probably due to local anthropogenic processes such as groundwater pumping. The results of these studies and in particular the principal features of the horizontal and vertical kinematic pattern, will be shown and discussed during the workshop. The first results obtained by a study concerning time variations of velocities observed in some GNSS stations and their possible correlations with tectonic processes, natural phenomena or anthropogenic activities. Acknowledgments. We are grateful to the following Institutions: ASI, ARPA Piemonte, FOGER (Fondazione dei Geometri e Geometri Laureati dell’Emilia Romagna), FREDNET – OGS, LEICA – Italpos, NETGeo – Topocon, Regione Abruzzo, Regione Friuli Venezia Giulia, Regione Lazio, Regione Liguria, Regione Piemonte, Regione Umbria – Labtopo (University of Perugia), Regione Veneto, RING-INGV, Provincia Autonoma di Bolzano (STPOS), Provincia Autonoma di Trento (TPOS), STONEX, which have kindly made available GPS recordings. ��� ������� The Figures have been carried out by the Generic Mapping Tools (Wessel et al. , 2013). References Arca S. and Beretta G.P.; 1985: Prima sintesi geodetica-geologica sui movimenti verticali del suolo nell’Italia Settentrionale. Boll. Geod. Sci. Aff., 44, 125-156. Altamimi, Z., Métivier, L. and Collilieux, X.; 2012: ITRF2008 Plate Motion Model. Journal of Geophysical Research , 117 , Article ID: B07402. http://dx.doi.org/10.1029/2011JB008930. Baldi P., Casula G., Cenni N., Loddo F. and Pesci, A.; 2009: GPS-based monitoring of land subsidence in the Po Plain (Northern Italy). Earth Planet. Science Letts., 288 , 204-212, doi:10.1016/j.epsl.2009.09.023. Baldi, P., Casula, G., Cenni, N., Loddo, F., Pesci,A., Bacchetti, M.; 2011: Vertical ad horizontal crustal movements in Central and Northern Italy . Boll.Soc.Geol.It. (Ital. J. Geosci.), 52 , 4, 667-685. Cenni N., Mantovani E., Baldi P. and Viti M.; 2012: Present kinematics of Central and Northern Italy from continuous GPS measurements. J. Geodyn., 58 , 62-72. Cenni, N., Viti, M., Baldi, P., Mantovani, E., Bacchetti, M.,Vannucchi, A.; 2013: Present vertical movements in central and northern Italy from GPS data: possible role of natural and anthropogenic causes . ������� �� ������������ Journal of Geodynamics, 71 , 74-85. doi: 10.1016/j.jog.2013.07.004. Cenni, N., Baldi P., Belardinelli, M.E., Gandolfi, S., Loddo, F., Mantovani E., Viti M.; 2015: The GPS vertical kinematic pattern In the Italian peninsula: characteristics and anthropogenic geodynamic implications. Atti del 34° Convegno Nazionale del Gruppo Nazionale di Geofisica della Terra Solida, 2015. 1 , 96-102. D’Anastasio, E., De Martini, P.M., Selvaggi, G., Pantosti, D., Marchioni, A., Maseroli, R.; 2006: Short-term vertical velocity field in the Apennines (Italy) revealed by geodetic levelling data . Tectonophysics, 418 , 219–234. Devoti, R., Esposito, A., Pietrantonio, G., Pisani A.R., Riguzzi, F., Evidence of large scale deformation patterns from GPS data in the Italian subduction boundary ; 2011, Earth and Planetary Science Letters, 311, 230–241 Devoti R., Pietrantonio G., Riguzzi F. (2014). ���� �������� ��� ����������� �� ������ ������ �� �� ������� ���� ��� GNSS networks for geodynamics in Italy. Física de la Tierra, Vol. 26, 11-24. Dong D., Herring T.A. and King R.W.; 1998: Estimating regional deformation from a combination of space and terrestrial geodetic data. J. Geod., 72 , 200-214.i Hackl M., Malservisi R., Hugentobler U. and Wonnacott R., 2011: Estimation of velocity uncertainties from GPS time series: Examples from the analysis of the South African TrigNet network . J. Geophys. Res., 116, B11404, doi:10.1029/2010JB008142. Herring T.A., King R.W., Floyd M.A. and McClusky S.C.; 2015a: GAMIT Reference Manual, GPS Analysis at MIT, Release 10.6 . Department of Earth, Atmospheric and Planetary Sciences, Massachusset Institute of Technology, Cambridge MA.