GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.3 GNGTS 2023 The earthquake simulator section currently contains ten seismic simulations of magnitude > 5. Each scenario was carried out by using SPEED (SPectral Elements in Elastodynamics with Discontinuous Galerkin) , an open source code developed at Politecnico di Milano. It is based on spectral elements technique and allows a discontinuous Galerkin treatment of the interfaces (Galli, 2009; Faccioli, 1997). The computational domain extends on 50x40x20 km in (x, y, z) around the city of L’Aquila and contains the three main seismogenic structures crossing the area, namely Paganica, Montereale e San Pio delle Camere. For each fault three different magnitudes are simulated (see table for details). An accurate reconstruction of the topographic surfaces as well the main alluvial basins are also included. For each scenario the slip distribution on the fault plane has been assigned by an earthquake generator tool available on SPEED (Antonietti, 2012). The last simulation refers to the L'Aquila 2009 earthquake, the interested reader can refer to Ameri (2012) for all details. The model resolution is around 4 Hz (depending on the domain under consideration) and the mesh size ranges from tens meters to one kilometers, for the deepest layers. All numerical simulations have been realized on the Linux HPC cluster Caliban of the High Performance Computing Laboratory of the Department of Information Engineering, Computer Science and Mathematics (DISIM) at the University of L’Aquila. We finally precise that in this contest the simulator is not able to predict damage patterns for which many other factors are involved, such as local effect, building characteristic and height frequency waves. It has the main purpose of raising awareness among the population and increasing knowledge of the territories. However, the research in the field of 3D-physically based models has made enormous progress in the last decades, and it is probable that, in the next future these techniques will be commonly used for the evaluation and reduction of the seismic risk, especially in combination with modern AI tools. Another section concurs to the financial aspects of the rebuilding process and contains information related to the social and economic impact of the reconstruction. The funds allocated are described in detail as well as the methods in which they were disbursed. Particular attention is paid to the use made of the sums received. Città & Territorio In the section of the site called "City & Territory" maps and georeferenced products deriving from aerial photogrammetric surveys, conducted through the use of Unmanned Aerial Vehicles (UAV), have been published. The field survey campaign had the objective of mapping the built-up areas located in the territory of the municipality of L'Aquila, in order to produce very high resolution maps, when compared with those obtained from satellites or currently available on the National Cartographic Web Portal and on the Cartographic Web Portal of the Abruzzo Region. The territorial survey involved the execution of approximately 400 flight missions, during which 160,000 images were acquired. The products obtained from the photogrammetric processing of the surveyed areas