GNGTS 2018 - 37° Convegno Nazionale

146 GNGTS 2018 S essione 1.1 RETRACE-3D PROJECT, A MULTIDISCIPLINARY APPROACH FOR THE CONSTRUCTION OF A 3D CRUSTAL MODEL: FIRST RESULTS AND SEISMOTECTONIC IMPLICATIONS D. Scrocca 1 , R. Basili 2 , S. Bigi 1 , L. Bonini 2 , R. Bonomo 3 , M. Buttinelli 2 , F. Capotorti 3 , S. Castenetto 4 , G.P. Cavinato 1 , M. Chiappini 2 , C. D’Ambrogi 3 , D. Di Bucci 4 , M. Di Filippo 1 , M. Di Nezza 2 , F. Ferri 3 , R. Giuliani 4 , F.E. Maesano 2 , M. Marino 3 , M.T. Mariucci 2 , L. Minelli 2 , P. Montone 2 , L. Petracchini 1 , M. Tiberti 2 , F. Villani 2 1 Consiglio Nazionale delle Ricerche - IGAG, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Italy 3 Istituto Superiore per la Protezione e la Ricerca Ambientale - Servizio Geologico d’Italia, Italy 4 Dipartimento della Protezione Civile, Italy The RETRACE-3D (centRal italy EarThquakes integRAted Crustal modEl) Project has been launched with the ambitious goal to build, as first result, a new, robust, 3D geological model of broad consensus of the area struck by the 2016-2018 Central Italy seismic sequence (e.g., Chiaraluce et al. , 2017; Scognamiglio et al. , 2018). The development of a high-quality 3D subsurface structural model will serve as a reference for further applications including, for instance: i) the possible improvement of velocity models currently used to locate the seismicity in its crustal volume and ii) the elaboration of dynamic models of the recognized seismogenic structures. To achieve these results, the RETRACE-3D Project blends together in a synergic way the multi-disciplinary skills of a large community of scholars (see details at www.retrace3d. it/Gruppo.html) made up by more than 60 researchers and experts from the Italian National Research Council (CNR Institutes IGAG and IREA), the National Institute of Geophysics and Volcanology, the Geological Survey of Italy (Department of ISPRA), and the National Civil Protection Department. In the past, the study area (more than 5,000 km2 wide) was investigated for hydrocarbon exploration purposes through the acquisition of a large number of 2D seismic reflection profiles, gravimetric and aeromagnetic data, together with the drilling of some scattered wells. These existing datasets were kindly made available by ENI and TOTAL companies in the frame of their participation to the National Service of Civil Protection. Moreover, the RETRACE- 3D Project dataset also includes geological, geophysical and satellite data deriving from the institutional activities of the involved research institutes. The RETRACE-3D Project has been organized in several work packages (WPs). WP0 Data management - All the datasets, with some additional resources (e.g. literature, task reports), are shared through a project-dedicated repository and meta-data catalogue, with restricted user access to confidential data. The final results will be shared via the RETRACE- 3D web site. WP1 Data preparation - The project structure includes a step of data preparation, to provide the participants with common harmonized and ready-to-use datasets. They are organized as input and comparison datasets, used respectively in WP2-WP3 and WP4. WP2 Shallow crustal model – This WP is devoted to the construction of a preliminary 3D crustal model mainly based on the interpretation of seismic reflection profiles, well data, surface geological constraints integrated with the analysis and modeling of gravimetric data; WP3 Model extended to seismogenic depths – The 3D model generated with the WP2 is then extended to seismogenic depths integrating the preliminary model with further information coming from Local Earthquakes Tomography (LET), thermal and rheological data, gravity and magnetic crustal modeling. WP4 Final crustal model - The final step consists of a geometric and kinematic validation (e.g., balancing and analogical modeling) and a cross-check against comparison datasets (e.g., SAR, GPS, coseismic surficial effects, seismogenic sources characteristics, Quaternary geology- geomorphology-neotectonics, seismic catalogues) not used during the modeling phases.