GNGTS 2018 - 37° Convegno Nazionale

156 GNGTS 2018 S essione 1.1 Herrmann R.B.; 1985: An extension of random vibration theory estimates of strong ground motion to large earthquakes . BSSA, 75 , 1447-1453. Luzi L., Pacor F. and Puglia R.; (2017): Italian Accelerometric Archive v 2.3 . Istituto Nazionale di Geofisica e Vulcanologia, Dipartimento della Protezione Civile Nazionale, doi: 10.13127/ITACA.2.3. Motazedian D. and Atkinson G.; 2005: Stocjastic finite-fault modeling based on a dynamic corner frequency . BSSA, 95 , 995-1010. Scarfì L., Barberi G., Barreca G., Cannavò F., Koulakov I. and Patanè D.; 2018: Slab narrowing in the Central Mediterranean: the Calabro-Ionian subduction zone as imaged by high resolution seismic tomography . Sci. Rep., 8 :5178, doi:10.1038/s41598-018-23543-8. Trifunac M.D. and Brady A.G.; 1975: A study on the duration of strong earthquake ground motion . BSSA, 65 , 581- 626. Zhang H., Thurber C. and Bedrosian, P.; 2009: Joint inversion for Vp, Vs, and Vp/Vs at SAFOD, Parkfield, California . Geochem. Geophys. Geosyst., 10 , Q110032, doi:10.1029/2009GC002709. ACTIVE DEFORMATION AT THE BORDERS OF THE CAMPANIAN PLAIN BASED ON INTEGRATION OF GEOLOGICAL AND SEISMOLOGICAL DATA S. Forlano¹, L. Ferranti¹, G. Milano² 1 Dipartimento di Scienze della Terra, delle Risorse e dell’Ambiente, Università Federico II, Napoli, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano, Napoli, Italy Joint analysis of geological and geophysical data provides a valid approach to the characterization of active crustal deformation. Geological-structural observations can be used to characterize exposed or shallowly buried structures that have been active in the recent past, whereas background seismicity analysis provides information on the current subsurface deformation. Integration of the two sets of observations allows bridging the gap between short and long-term deformation processes and mechanisms. Active deformation in the Campania region of southern Italy occurs both at a local scale due to the presence of volcanic processes along the Tyrrhenian margin, and at a regional scale where it is expressed by extensional and transtensional tectonics that created the transition between the Tyrrhenian margin and the Apennines. Consequently, this region is characterized by two different tectonic domains of a recent and active deformation. The Tyrrhenian margin includes a submerged shelf, the volcanic areas of Vesuvius and Campi Flegrei, and the Campanian Plain (Fig. 1), which is a sector of high-rate Quaternary subsidence where an up to ~3.5 km thick extensional basin fill rests above a domino-block faulted substratum (Milia et al. , 2003). Quaternary extension was accommodated by E-W and ENE-WSW striking, listric-shaped normal faults that created major offshore and coastal depocenters segmented by buried ridges (e. g. Acocella & Funiciello, 2006; Milia et al., 2013). Although some of these faults are supposedly active and control the Late Pleistocene-Holocene tectonics and volcanism, they are not associated to moderate-large historical earthquakes. Conversely, the nearbyApennines chain to the east is characterized by Pleistocene uplift and by NW-SE striking left-transtensional faults active under a ~NNW-SSE extension axis. Since the Middle-Late Pleistocene, NE-SW extension on the same or newly formed faults, some of which are associated to large earthquakes that nucleate at 10-15 km depth (Ferranti et al. , 2014 and references therein), overprinted the earlier left transtension in the Apennines. Previous works based on geophysical data (Florio et al. , 1999; Luiso et al. , 2018), on geomorphological observations supported by borehole drills (Brancaccio et al. , 1991; Romano et al. , 1994; Aprile et al., 2004; Bellucci et al., 2004) and on comparison with offshore seismic reflection profiles (Bruno et al. , 2000; Milia et al. , 2003) showed that the subsurface