GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 In-depth third level Seismic Microzonation studies in pilot areas of L’Aquila Municipality (Central Italy) M. Tallini 1 , M. Spadi 1 , E. Morana 1 , A. Chiaradonna 1 , P. Monaco 1 , M. Compagnoni 2 , F. Pergalani 2 , G. Di Giulio 3 , G. Milana 3 , M. Vassallo 3 , C. Cattani 1 , C. Montaldi 1 , F. Zullo 1 , A. Sciortino 1 , M. Basi 4 1 Dipartimento di Ingegneria Civile, Edile-Architettura e Ambientale, Università degli Studi dell'Aquila 2 Dipartimento Ingegneria Civile Ambientale, Politecnico di Milano 3 Istituto Nazionale di Geofisica e Vulcanologia 4 Agenzia regionale di Protezione Civile - Ufficio Rischio Sismico, Regione Abruzzo Introduction The proposed study is part of the third level Seismic Microzonation (SM) project activities carried out on a 7 km 2 wide pilot areas (Preturo-Sassa and Bazzano-Monticchio) of L'Aquila Municipality financed by the Abruzzo Region (Department of Government of the Territory and Environmental Policies - Risk Prevention Service of Civil Protection). L’Aquila Municipality pertains geologically to the middle Aterno River intermontane basin which was filled up by Plio-Quaternary coarse- and fine-grained detrital deposits related mainly to lacustrine, slope and alluvial environments and is characterised furthermore by a considerable seismic hazard as evidenced by the recent April 6, 2009 Mw 6.29 near source earthquake (Nocentini et al., 2017). According to the DPC guidelines (Gruppo di lavoro MS, 2008), numerical maps and database were produced at the end of the third level SM project. The project was realized through the following activities, carried out in sequence and, partly, in parallel way: (i) update of database concerning boreholes, geotechnical and geophysical in-situ investigations; (ii) seismic input selection; (iii) computer code selection; (iv) geophysical and geotechnical soil characterization; (v) elaboration of the geological sections; (vi) 1D and 2D modelling; (vii) evaluation of the site liquefaction potential; (viii) mapping the third level SM microzones based on the calculated Amplification Factors and the estimated soil liquefaction potential; (ix) third level SM numerical maps elaboration. Database, seismic input, and computer code selection