PSI - Issue 84

Martina Caruso et al. / Procedia Structural Integrity 84 (2026) 143–150

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The platform is designed to accommodate both basic and advanced users, enabling a wide range of earthquake scenario analyses, from simple visual exploration to full scenario simulations with custom inputs. Basic users can explore pre-calculated earthquake scenarios and visualise their key input models and outputs through an intuitive web interface. This user level is designed to facilitate access to seismic damage/loss information, supporting decision making, awareness, and preliminary analyses without requiring technical expertise or model manipulation. Alternatively, advanced users have access to extended capabilities, allowing the calculation of new scenarios directly, using the OQ Scenario Calculators, starting from ruptures of the available catalogue, combined with pre-compiled or user-defined hazard, exposure, and fragility/consequence models. For a given earthquake scenario, the platform supports the generation and visualisation of maps of mean ground motion fields, with a dedicated layer for each available intensity measure. It also allows the display of damage/loss layers derived from the same scenario, including buildings beyond repair (i.e., in a complete damage state), economic losses, and fatalities, aggregated at multiple administrative levels (region, province, or municipality). By selecting a polygon, users can access localised statistics in a side panel, showing administrative information and total damage/loss values for the chosen area. The panel also includes interactive charts showing the distribution of the selected damage/loss metric, disaggregated by material type and occupancy class, supporting deeper exploration of scenario results. Fig. 3 presents an example of damage map showing the number of buildings beyond repair, aggregated at the provincial level, for the 2012 Emilia Romagna earthquake of May 29th. The platform also provides a “See more details” page with expanded scenario outcomes, reporting average values and 5th-95th percentiles by material type and occupancy class, along with rankings of the most affected administrative units in both absolute and relative terms. In parallel, the platform enables visualisation of earthquake scenario impacts on infrastructure by evaluating the spatial overlap between footprints of earthquake sub-perils (ground shaking, landslides, and liquefaction) and exposed assets, such as road pavements and bridges. This method allows the assessment of infrastructure exposure to earthquake sub-perils while remaining computationally efficient and fully compatible with the platform. It helps identify, for a given scenario, regions with higher exposure to specific sub-perils and facilitates comparisons of how roads and bridges are affected across regions. For each sub-peril, impacts are classified into three exposure levels (low, medium, and high) based on different thresholds. Importantly, the analysis does not account for the structural vulnerability of individual assets, which depends on their design and material. Fig. 4 offers an example of how the platform shows the scenario outputs for bridges following the 2016 Central Italy earthquake of August 24th.

Fig. 3. Buildings beyond repair (i.e., in complete damage) at the province level, for the 2012 Emilia Romagna earthquake of May 29th.