## 1 Introduction
#### Multi-Hazard Context in the Basilicata Region
6 of the European Union Floods Directive (2007/60/EC): High-Probability Hazard (HPH--a high probability of floods); Medium-Probability Hazard (MPH--a medium probability of floods); Low-Probability Hazard (LPH--a low probability of floods). According to Legislative Decree 49/2010, these scenarios correspond to the areas that can be flooded following flood events, with return periods between 20 and 50 years (HPH--high probability of or frequent floods), between 100 and 200 years (MPH--medium probability of or infrequent floods), and with a return period exceeding 200 years (LPH--low probability of extreme event scenarios). Concerning the landslide hazard, the informative layer contains information about landslides that have already occurred and the portion of territories potentially susceptible to new landslide events [34]. In this case, the landslide hazard classification is distinguished into four main classes (P1, P2, P3, and P4) on the basis of interventions that can be implemented. According to ISPRA [34], class P4 covers areas characterized by a \"very high landslide hazard\" (P4), where building demolition and vulnerability reduction, mass movement reclamation, and maintenance of mass movement areas are permitted. In areas classified as having a \"high landslide hazard\" (P3), in addition to the interventions included in P4 areas, expansion interventions in existing buildings for hygiic-sanitary adaptation and the construction of new waste treatment plants are generally considered. In areas classified as having a \"medium landslide hazard\" (P2), the interventions are those provided  
Figure 1: (**a**) Spatial distribution of landslide and flood hazard in the Basilicata Region (the attention areas (AA) correspond to portions of the territory characterized by possible instability to which no hazard class has yet been associated [34]); (**b**) geographic location of the Basilicata Region within the national context. Data were collected from the IdroGEO website ([[https://idrogeo.isprambiente.it/app/page/open-data](https://idrogeo.isprambiente.it/app/page/open-data)]([https://idrogeo.isprambiente.it/app/page/open-data](https://idrogeo.isprambiente.it/app/page/open-data)), accessed on 20 March 2024). Basemap: Google Satellite. via territorial and urban planning and are generally subject to safety checking for instability conditions and geomorphological process changes. Finally, in areas classified as having a \"moderate landslide hazard\" (P1), any type of general intervention envisaged via territorial and urban planning is authorized. More detailed information about the national landslide inventory and the kinematics linked to these events can be found in the IFFI project ([[https://idrogeo.isprambiente.it/app/iffi/r/177@=40.520557401702234,16.101003400000003,5](https://idrogeo.isprambiente.it/app/iffi/r/177@=40.520557401702234,16.101003400000003,5)]([https://idrogeo.isprambiente.it/app/iffi/r/177@=40.520557401702234,16.101003400000003,5](https://idrogeo.isprambiente.it/app/iffi/r/177@=40.520557401702234,16.101003400000003,5)), accessed on 20 March 2024), whereas regional data can be collected from the landslide inventory map created by [PERSON] et al. (2020). The delimitation of flood and landslide hazard areas has led to the calculation of exposure indicators (2021), which are shown in Table 2, with a general focus on the multi-hazard context in the Basilicata region.