GNGTS 2021 - Atti del 39° Convegno Nazionale

GNGTS 2021 S essione 2.2 368 TOWARD SHARING SOIL AND BUILDING GEOPHYSICAL DATA FOR URBAN SEISMIC CHARACTERIZATION: THE CLARA WEBGIS FOR THE CITY OF MATERA (SOUTHERN ITALY) N. Tragni 1,2 , G. Calamita 1 , L. Lastilla 3,4 , V. Belloni 5 , R. Ravanelli 5 , M. Lupo 1 , V. Salvia 1 , M.R. Gallipoli 1 1 National Research Council of Italy (CNR-IMAA), Tito Scalo, Italy 2 School of Engineering, University of Basilicata, Potenza, Italy 3 Department of Computer, Control and Management Engineering Antonio Ruberti (DIAG), Sapienza University of Rome, Rome, Italy 4 Sapienza School for Advanced Studies, Rome, Italy 5 Geodesy and Geomatics Division, DICEA, Sapienza University of Rome, Rome, Italy Abstract The Italian seismic history has taught us that seismic events become catastrophic when neglected by the society. In most cases, society is unprepared for seismic risk not only for having neglected it, but also due to a lack of knowledge. The implementable set of seismic risk mitigation strategies (i.e., urban planning, seismic retrofitting, etc.) to reduce the negative effects of earthquakes on all vulnerable elements can be enhanced by sharing information about the seismic aspects specific to a given urban environment with the widest number of possible end users (central and local governments, planners and administrators, engineers and professional geologists, citizens, etc.). Open data and modern web-based geospatial technologies, e.g., like WebGIS, are valuable tools for sharing knowledge. These tools are widely used for publicly disseminating information and for natural risk assessment and communication (Müller et al., 2006; Frigerio et al., 2010; Fago et al., 2014; Huang et al. 2015, Pessina and Meroni, 2009; Francini et al., 2018). In this view, this study presents CLARA WebGIS (https://smartcities- matera-clara.imaa.cnr.it/) , an open disseminative geodatabase, through which the user can visualize and download (i) a total of 488 geological, geotechnical, and geophysical surveys on soils and buildings (Fig. 1-A); (ii) the spatial distribution of the urban soils fundamental resonance frequency (Fig. 1-B); (iii) the main vibrational frequencies for the 4043 overlying buildings (Fig. 1-B); (iv) the spatial distribution of the soil–building resonance levels for the urban area of Matera (Fig. 1-C); (v) a new digital surface model (Fig. 1-D) obtained by optical satellite images (Lastilla et al., 2021). The CLARA WebGIS is the first tool that is useful to predict which and how many buildings could have increased damage due to soil-building resonance effect. Therefore, for the first time the urban seismic characterization has been done according to a holistic vision by studying together geophysical properties of both urban subsoil and overlying buildings (Gallipoli et al., 2020). From a Smart Cities perspective, the scientific and technological challenge of CLARA WebGIS consists in developing innovative product for the mitigation of seismic risk in urban and semi-urban areas through the active involvement of Public Administrations (service-oriented approach).