GNGTS 2015 - Atti del 34° Convegno Nazionale

among the ones so far proposed. Since this result can hardly be reconciled with the lack of a decoupling zone between Nubia and Adria, we suppose that such evidence might result from a transient non-rigid behavior of the Adria lithosphere. This hypothesis is supported by the fact that in the last tens of years (since 1930) most major peri-Adriatic decoupling earthquakes have mostly occurred in the southern boundary zones (northern Hellenides, Albanides, southern Dinarides, southern and central Apennines). Considering the effects of post seismic relaxation induced by such shocks, the above seismicity distribution may imply that Adria is affected by a transient internal deformation, for instance accommodated by longitudinal upward flexure. It is then argued that the GPS velocity field is compatible with the kinematic pattern of the Apennine belt, Calabria and Sicily proposed by Mantovani et al. (2009) and Viti et al. , (2011), whereas it can hardly be reconciled with the kinematics expected from the alternative geodynamic interpretation proposed by a number of authors, invoking the contribution of slab roll-back in the Apennine trench zone. References Altamimi Z., Métivier L., Collilieux X.; 2012: ITRF2008 plate motion model . J. Geophys. Res., 117 , B07402. Anderson H., Jackson J.; 1987: Active tectonics of the Adriatic region . Geophys. J.R. Astron. Soc., 91 , 937-983. Argnani A.; 2006: Some issues regarding the central Mediterranean neotectonics . Boll. Geof. Teor. Appl., 47 , 13-37. Argus D.F., Gordon R.G., Heflin M.B., Ma C., Eanes R.J., Willis P., Peltier W. R., Owen S.E.; 2010: The angular velocities of the plates and the velocity of Earth’s centre from space geodesy . Geophys. J. Int., 180 , 913-960. Babbucci D., Tamburelli C., Viti M.,Mantovani E., Albarello D., D’Onza F., Cenni N., Mugnaioli E.; 2004: Relative motion of the Adriatic with respect to the confining plates: seismological and geodetic constraints . Geophys. J. Int., 159 , 765-775. Bennett R. A. et al. ; 2012: Syn-convergent extension observed using the RETREAT GPS network, northern Apennines, Italy . J. Geophys. Res., 117 , B04408. Cenni N., Mantovani E., Baldi P., Viti M.; 2012: Present kinematics of Central and Northern Italy from continuous GPS measurements . J. Geodynamics, 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 . J. Geodynamics, 71 , 74-85. D’Agostino N., Avallone A., Cheloni D., D’Anastasio E., Mantenuto S., Selvaggi G.; 2008: Active tectonics of the Adriatic region from GPS and earthquake slip vectors . J. Geophys. Res., 113 , B12413. D’Agostino N., D’Anastasio E., Gervasi A., Guerra I., Nedimovic M.R., Seeber L., Steckler M.; 2011: Forearc extension and slow rollback of the Calabrian Arc from GPS measurements . Geophys. Res. Lett., 38 , L17304. DeMets C., Gordon R.G., Argus D.F.; 2010: Geologically current plate motions . Geophys. J. Int., 181 , 1-80. Devoti R., Esposito A., Pietrantonio G., Pisani A.R., Riguzzi F.; 2011: Evidence of large scale deformation patterns from GPS data in the Italian subduction boundary . Earth Planet. Sci. Lett., 311 , 230-241. Faccenna C., Funiciello F., Civetta L., D’Antonio M., Moroni M., Piromallo C.; 2007: Slab disruption, mantle circulation, and the opening of the Tyrrhenian basins . In: Beccaluva L., Bianchini G., Wilson M. (Eds.), Cenozoic Volcanism in the Mediterranean Area. Geol. Soc. Am. Spec. Paper 418 , 153-169. Fantoni R., Franciosi R.; 2010: Tectono-sedimentary setting of the Po Plain and Adriatic foreland . Rend. Fis. Acc. Lincei, 21 (Suppl.1), S197-S209. Finetti I.R., Boccaletti M., Bonini M., Del Ben A., Pipan M., Prizzon A., Sani F.; 2005: Lithospheric tectono- stratigraphic setting of the Ligurian sea-Northern Apennines-Adriatic foreland from integrated CROP seismic data. In: Finetti I.R (Ed.), Deep Seismic Exploration of the Central Mediterranean and Italy, CROP PROJECT. Elsevier, Amsterdam, pp. 119-158 (Chapter 8). Lacan P., Ortuno M.; 2012: Active tectonics of Pyrenees: a review , J. Iberian Geol., 38 , 9-30. Malinverno A., Ryan W.B.F.; 1986: Extension in the Tyrrhenian Sea and shortening in the Apennines as result of arc migration driven by sinking of the lithosphere . Tectonics, 5 , 227-245. Mantovani E., Viti M., Babbucci D., Tamburelli C., Albarello D.; 2006: Geodynamic connection between the indentation of Arabia and the Neogene tectonic evolution of the Central-Eastern Mediterranean Region. In: “Post-collisional tectonics and magmatism in the eastern Mediterranean region”, Dilek, Y. and Pavlides, S. (Eds.), Geol. Soc. Am., Special Volume 409 , 15-41. Mantovani E., Viti M., Babbucci D., Albarello D.; 2007: Nubia-Eurasia kinematics: an alternative interpretation from Mediterranean and North Atlantic evidence . Ann. Geophysics, 50 , 311-336. Mantovani E., Babbucci D., Tamburelli C., Viti M.; 2009: A review on the driving mechanism of the Tyrrhenian- Apennines system: jmplications for the present seismotectonic setting in the Central-Northern Apennines . Tectonophysics, 476 , 22-40. 126 GNGTS 2015 S essione 1.2