Role of Antecedent Rainfall in the Earthquake-Triggered Shallow Landslides Involving Unsaturated Slope Covers

Different soil cover saturation has a significant effect in influencing slope stability conditions of weathered covers under earthquake-induced shaking. Here we analyze the Montecilfone, Italy (2018), case history, an Mw 5.1 earthquake that revealed exceptionality spatial distribution surveyed shallow landslides. This feature can be justified as intense rainfall occurred epicentral area before seismic event, contributing to increasing and weight covers. To verify effective influence antecedent preparatory factor triggering covers, for both static dynamic scenarios were validated by reconstructing different related event earthquake. Soil surveying was performed within 150 km2 output its terms their compositional features thickness, whose variability constrained through empirical models. Based on laboratory test results, 1D infiltration numerical models Hydrus-1D free domain software estimate degree water depth, taking reference intensity event. sequential charts content obtained at depths times up those recorded time occurrence modelling. Safety factors (SFs) quantified assuming unsaturated condition equation. The outputs reveal pore pressure medium infers scenario landsliding, demonstrating role