GNGTS 2015 - Atti del 34° Convegno Nazionale

Mantovani E., Viti M., Babbucci D., Tamburelli C., Cenni N., Baglione M., D’Intinosante V.; 2015a: Recognition of periAdriatic seismic zones most prone to next major earthquakes: insights from a deterministic approach . In: D’Amico S. (Ed.), Earthquakes and Their Impact on Society. Springer Natural Hazard Series, Springer, in press. Mantovani E., Viti M., Cenni N., Babbucci D., Tamburelli C., Baglione M., D’Intinosante V.; 2015b: Seismotectonics and present seismic hazard in the Tuscany-Romagna-Marche-Umbria Apennines (Italy) . J. Geodynamics, 89 , 1-14. Mantovani E., Viti M., Babbucci D., Tamburelli C., Cenni N., Baglione M., D’Intinosante V.; 2015c: Present tectonic setting and spatio-temporal distribution of seismicity in the Apennine belt . Int. J. Geosciences, 6 , 429-454. Nocquet J.-M.; 2012: Present-day kinematics of the Mediterranean: A comprehensive overview of GPS results . Tectonophysics, 579 , 220-242. Scafidi D., Solarino S.; 2012: Can local earthquake tomography settle the matter about subduction in the Northern and Central Apennines? Response from a new high resolution P velocity and Vp/Vs ratio 3-D model. Tectonophysics, 554-557 , 63-73. Schellart W.P., Moresi L.; 2013: A new driving mechanism for backarc extension and backarc shortening through slab sinking induced toroidal and poloidal mantle flow: Results from dynamic subduction models with an overriding plate . J. Geophys. Res. Solid Earth, 118 , 3221-3248. Spakman W., Wortel R.; 2004: A tomographic view on Western Mediterranean Geodynamics . In: Cavazza W., Roure F., Spakman W., Stampfli G.M., Ziegler P. (Eds.), The TRANSMEDAtlas, The Mediterranean Region from Crust to Mantle, pp. 31-52. Viti M., Mantovani E., Babbucci D., Tamburelli C.; 2006: Quaternary geodynamics and deformation pattern in the Southern Apennines: implications for seismic activity . Boll. Soc. Geol. It., 125 , 273-291. Viti M., Mantovani E., Babbucci D., Tamburelli C.; 2011: Plate kinematics and geodynamics in the Central Mediterranean . J. Geodynamics, 51 , 190-204. Viti M., Mantovani E., Babbucci D., Tamburelli C., Cenni N., Baglione M., D’Intinosante V.; 2015: Belt-parallel shortening in the Northern Apennines and seismotectonic implications . Int. J. Geosciences, 6 , 938-961. Weber J., Vrabec M., Pavlovčič-Prešeren P., Dixon T., Jiang Y., Stopar B.; 2010: GPS-derived motion of the Adriatic microplate from Istria Peninsula and Po Plain sites, and geodynamic implications . Tectonophysics, 483 , 214- 222. A geophysical transect across the central sector of the Ferrara Arc: detailed gravimetric survey – part I F. Palmieri 1 , A. Mantovani 2 , G. Santarato 2 1 OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale) Trieste, Italy 2 Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Ferrara, Italy Introduction. The investigated area for this study is the eastern sector of the Po Plain that represents the foredeep basin of both Southern Alps and northern Apennines. We focused our attention on the Ferrara Arc (Fig. 1a), which is one of the major arcs, consisting of blind, north- verging thrusts and folds, which represent the external northern Apennines front (Pieri and Groppi, 1981; Bigi et al. , 1982; Boccaletti et al. , 2004). The recent tectonic activity of this area is well documented by the occurrence of moderate earthquakes, such as the 1570 Ferrara, and 1624 Argenta earthquakes (Guidoboni et al. , 2007; Rovida et al. , 2011) and recently in May 2012, when two moderate (Mw 6.1 and 5.9; e.g. Pondrelli et al. , 2012) earthquakes affected the western Ferrara province. The bending of the topographic surface and the consequent uplift of the broader epicentral area are among the major coseismic effects due to the reactivation of reverse blind faults as, for example, in the case of the northern Apennines underlying the Po Plain: in fact, as a consequence of the fault geometry and kinematics, the rock volume above the co-seismic rupture tip is characterised by a typical fault-propagation folding process (Okada, 1985). Depending on the seismotectonic parameters of the underlying seismogenic source, the uplifted area has an GNGTS 2015 S essione 1.2 127