GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 High-resolution geophysical investigations in the central Apennines seismic belt: preliminary results from the Campo Felice tectonic basin. F Villani 1 , S Maraio 1 , V Sapia 1 , G Di Giulio 1 , L Improta 1 , P M De Martini 1 , V Materni 1 , P Baccheschi 1 , M Pischiutta 1 , M Vassallo 1 , P P Bruno 2 , C A Brunori 1 , R Civico 1 , T Ricci 1 , S Lovati 1 , C Felicetta 1 , A Lorenzetti 1 , P Manganello 1 , A D’Alessandro 1 , S Scudero 1 1 Istituto Nazionale di Geofisica e Vulcanologia 2 Università Degli Studi di Napoli Federico II In the framework of the INGV Project Pianeta Dinamico funded by MUR, during summer-autumn 2020 we performed a series of multi-disciplinary geophysical investigations in the Campo Felice basin, Central Italy. This depression is a half-graben developed in the hangingwall of a complex segmented system of NW-trending normal faults that reach a compound length of about 30 km (L’Aquila-Ovindoli-Celano fault system; Salvi et al., 2003), and include segments with well documented late Pleistocene to Holocene activity (among the others Bosi, 1975; Pantosti et al., 1996; Giaccio et al., 2003; Benedetti et al., 2013; Wilkinson et al., 2015; Goodall et al., 2021). The Campo Felice basin was the target of numerous field geological-structural surveys aimed primarily at defining the geometry, kinematic and evolution of its bounding fault segments quoted as potential sources of M6+ earthquakes (Schirripa-Spagnolo et al., 2021, and references therein). On the contrary, little is known about the basin subsurface and its internal stratigraphic and structural architecture. Our surveys aimed at bridging this information gap by determining cross-disciplinary geophysical images of the subsurface (down to the basin bottom) that are critical to improve understanding of the basin structure and tectonic evolution. We focused on the central portion of the Campo Felice basin because this zone is where the bounding fault (Mt. Cefalone – Serralunga fault) likely accrued the largest long-term displacement. Besides, this zone presents good logistic conditions to perform deep penetrating seismic active surveys. Our exploration strategy combined high-resolution seismic reflection profiling and refraction tomography, electrical resistivity tomography (ERT) and ambient noise measurements through seismic stations. We collected seismic data by using a powerful vibratory source and a multi-channel acquisition system (240-264 vertical sensors spaced 5 m) that allowed us to investigate the subsurface down to several hundreds of m depth. We acquired two intersecting profiles trending NNE-SSW (profile