GNGTS 2016 - Atti del 35° Convegno Nazionale

414 GNGTS 2016 S essione 2.2 level 2 – simplified analyses and level 3 – in-depth quantitative analyses. The first level aims at defining areas that may suffer ground motion amplifications and/or susceptibility to instabilities (i.e. significant permanent deformations): due to active and capable faults, liquefaction phenomena, landslides. The second and third levels are related to quantitative estimations of co- seismic effects through simplified (level 2) or advanced (level 3) analyses. This work presents the case study of the Sulmona intramontane basin located in the Central-Northern sector of the Apennine chain, in the Abruzzi Region. The basin infill consists of a thick lacustrine succession passing to different orders of terraced alluvial deposits (Fig. 1). Here areas susceptible/not susceptible to liquefaction phenomena have been investigated through an analytical simplified approach (level 2) where the first level studies identified potential liquefiable areas. Fig. 1 – a) Location map. b) Simplified geological map of the Sulmona urban area with the unstable areas defined at the first level microzoning: active and capable normal faults (FAC and FPAC), liquefaction and landslides. c) Simplified geological cross-section through the Sulmona basin. The activity of the Quaternary normal faults guided the development of a deep basin filled by a thick Pleistocene fluvio-lacustrine succession. The deepest borehole available in the area investigated the subsurface up to 435 m of depth without reaching the pre-Quaternary carbonate geological bedrock.