GNGTS 2016 - Atti del 35° Convegno Nazionale

234 GNGTS 2016 S essione 1.2 Chamoli, A., Lowry, A. R., Jeppson, T. N.; 2014: Implications of transient deformation in the northern Basin and Range, western United States . Journal of Geophysical Research Solid Earth, 119 , 4393-4413, doi: 10.1002/2013JB010605. Chiaruttini C., Zadro M.;1976: Horizontal pendulum observations at Trieste. Udine Meeting on the Friuli Earthquake, 1976. Boll. di Geof. Teorica ed Applicata, Vol.XIX, n.72, 441-455. Connolly, J. A. D., Podladchikov, Y. Y.; 1998: Compaction driven fluid flow in viscoelastic rock . Geodinamica Acta 11, 55-84, doi:10.1016/S0985-3111(98)80006-5. Connolly, J. A. D., Podladchikov, Y. Y.; 2013: A Hydromechanical model for lower crustal fluid flow . In: Harlov, D.E., and H. Austrheim (Eds). Metasomatism and the chemical transformation of rock. Lecture Notes in Earth System Science s, 599-658. doi: 10.1007/978-3-642-28394-9_14. Dragert, H., Wang, K., James T.S.; 2001: A Silent Slip Event on the Deeper Cascadia Subduction Interface , Science, 292 , 1525-1528, DOI: 10.1126/science.1060152. Dragoni M., Bonafede M., Boschi E.; 1984/85: On the interpretation of slow ground deformation precursory to the 1976 Friuli earthquake , Pure Appl. Geophys., 122 , 781-792. Gegout, P., Boy, J.-P., Hinderer, J., Ferhat, G.; 2010: Modeling and Observation of Loading Contribution to Time- Variable GPS Sites Positions . IAG Symposia 135 (8), 651-659. Kastelic, V., Vrabec, M., Cunningham, D., Gosar, A.; 2008: Neo-Alpine structural evolution and present-day tectonic activity of the eastern Southern Alps: The case of the Ravne Fault, NW Slovenia . Journal of Structural Geology, 30 , 963-975, doi:10.1016/j.jsg.2008.03.009. Miller, S. A., Collettini, C., Chiaraluce, L., Cocco, M., Barchi, M., Kaus, B. J. P.; 2004: Aftershocks driven by a high- pressure CO2 source at depth . Nature 427, 724–727, doi:10.1038/nature02251. Rossi G., Zuliani D., Fabris P.; 2013: Slow transient recorded by the cGPS network FreDNet at the Adria northern tip (NE-Italy) , 32° Convegno GNGTS, Trieste 2013. Rossi G., Zuliani D., Fabris P.; 2016: Long-term GNSS measurements through Northern Adria microplate reveal fault- induced fluid mobilization , Tectonophysics, in press. Spiegelman, M.; 1993a: Flow in deformable porous media. Part 1. Simple analysis , Journal of Fluid Mechanics, 247 , 17-38. Spiegelman, M.; 1993b: Flow in deformable porous media. Part 2. Numerical analysis – the relationship between shock waves and solitary waves . Journal of Fluid Mechanics, 247 , 39-63. Vesnaver, A. and Böhm, G.; 2000: Staggered or adapted grids for seismic tomography? . The Leading Edge, 19 , (9), 944-950. Multi-year hydrologically-related transient deformation observed by GPS in the Southern Apennines: implications for tectonic rates and karst aquifer behaviour F. Silverii 1 , N. D’Agostino 1 , M. Métois 2 , F. Fiorillo 3 , G. Ventafridda 4 1 Istituto Nazionale di Geofisica e Vulcanologia, Centro Nazionale Terremoti, Roma, Italy 2 Univ Lyon, Université Lyon 1, Villeurbanne, France 3 Università degli studi del Sannio, Dipartimento di Scienze per la Biologia, la Geologia e l’Ambiente, Benevento, Italy 4 Acquedotto Pugliese S.p.A., Bari, Italy Introduction. In the last decades increasing interest has been focused on the detection of transient deformation signals in geodetic observations. These are usually related to transitory episodes of strain release/accumulation appearing as temporary deviations from steady-state, long-term displacements associated with relative plate motions and steady interseismic strain accumulation on active faults (Riel et al. , 2014). Transient signals can be of both tectonic (e.g. postseismic and volcanic) and non-tectonic (e.g. hydrological) origin. It it indeed well known nowadays that redistribution of water masses at the Earth surface affects the surface measurements of crustal displacements. The detection and analysis of non-tectonic transients in the geodetic time series is important for several reasons: i) non-linear behaviour provides insights into important aspects of fault mechanics (e.g., slow slip events); ii) the identification of the tectonic/non-tectonic cause of the signal is fundamental to correctly estimate the transient