Permanent ground displacement for dip slip faulting: a modelling approach

Moratto L;Peruzza L
2024-01-01
2024
Permanent ground displacement due to coseismic faulting is a major threat as it can cause heavy damages to the building stock, and distributed critical facilities. Nowadays, the capabilities of predicting the displacement demand are based on probabilistic fault‐displacement hazard analyses (PFDHA), poorly constrained for the lack of detailed observations, expecially for moderate-to-major earthquakes on dip-slip shallow seismic sources. We used a Physics-Based Simulations modelling tool that adopts of pseudo-dynamic source model (Moratto et al., 2015; 2023) to compute permanent, static and coseismic, surface displacement on a suite of hypothethic fault sources, grounded on plausible geologic conditions, and constrained by the current knowledge on the earthquake rupture processes. In this way we can explore the along- and across-fault variability of the theoretical ground displacement, the impact of aleatory and epistemic components, and thus we will be able to define general relationships complementing the observational datasets. Our testing case is tuned on shallow dip slip faults, capable of generating M5.5-6.5 earthquakes; the modelling results are compared to the field observations collected in Central Italy during recent damaging earthquakes by the Fault2SHA Central Apennines Database (Faure Walker et al., 2021), and by the most updated fault displacement measurements (Nurminen et al., 2022). We present some preliminary results that are promising for PFDHA model development.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14083/31304
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