A new multi-method approach to constrain fault geometry: the cases of the Paganica and Mt. Vettore - Mt. Bove faults (central Italy)

The aim of the study is to identify the active structures in the Paganica and Mt. Vettore-Mt. Bove areas from geo-structural, seismological and gravimetric data in GIS environment and to constrain their geometry at depth with a combined interpretation of 2-D hypocentral sections and a multiscale analysis of the gravity field. Our multi-scale gravimetric analysis allowed identifying: - the primary fault plane of the Paganica system, displacing rocks with different densities down to about 10 km and dipping westward with an angle of 45°; - the primary Mt. Vettore-Mt. Bove fault of the 2016-2017 sequence, SW dipping; - the antithetic fault of the Mt. Vettore-Mt. Bove fault system that activated during the seismic sequence; this antithetic fault is buried, i.e., it has no geological signature at the surface; - the primary Norcia fault that also activated during the seismic sequence; - a silent fault bordering the western margin of the Norcia basin, well-known in the geological literature.