GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 2.2 GNGTS 2024 Fig. 1 – (A) Engineering-geological map of the Ferrara municipality area, the yellow ribbons depict Po and Reno channel sand bodies; (B) enclosure diagram extracted from the the 3D model of the first 40 m of the urban area subsurface, derived from the automated tricubic interpolaCon of more than 1000 subsurface logs; (C) N-S secCons extracted from the same model, sand lithologies are depicted in red, cohesive muds in blue, late Pleistocene synglacial sands are covered by Holocene lower alluvial plain deposits. Seismic amplificaHon and local response The spectral selecCve amplificaCon of seismic waves shows rapid spaCal variaCons, even within the comparaCvely small urban area of Ferrara, due to the complex geological architecture. The seismic bedrock, defined by rocks with S-waves speed exceeding 800 m/s, is everywhere covered by thick unlithified late Quaternary units. The bedrock rises in the