## 2 Materials and Methods
### Test Areas and Datasets  
The proposed procedure was applied and tested in two study areas in the municipalities of Vaglio Basilicata and Trivigno (Basilicata region, southern Italy). Both municipalities are located in the upper part of the Basento river basin. From a geological point of view, Vaglio Basilicata presents a complex tectonic unit mainly characterized by the outcropping of the Flysch Rosso formation (Upper Cretaceous-Eocene) and structurally complex claye-mary succession referred to as the Lagonegro Unit [40]. The geological context of Trivigno is characterized by alternating layers of competent rock and clay shale deposited during the Oligocene-Moocene Age, then subjected to tectonic uplift. They present a highly disturbed structure, and the clay shale component is highly fissured [41]. Therefore, both study areas are widely affected by slow-moving landslides occurring in geological units strongly fractured and severely deformed due to their severe tectonic history [42]. Indeed, the official inventory map developed by the Interregional River Basin Authority of Basilicata region reports 157 slow-moving landslides in Vaglio Basilicata and 724 in Trivigno (Figure 2). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Combination** & **Landslide** & \
\begin{tabular}{c} **Susceptibility** \\ **Index** \\ \end{tabular} & **Velocity** &
\begin{tabular}{c} **Damage** \\ **Severity Level** \\ \end{tabular} & **Risk** \\ \hline
01r & yes & \textgreater{}0 & moving & damaged & high \\
02r & yes & \textgreater{}0 & not moving & damaged & medium \\
03r & yes & \textgreater{}0 & moving & damaged & medium \\
04r & yes & \textless{}0 & moving & damaged & medium \\
05r & yes & \textless{}0 & not moving & damaged & low \\
06r & yes & \textgreater{}0 & not moving & undamaged & low \\
07r & yes & \textless{}0 & moving & undamaged & low \\
08r & yes & \textless{}0 & not moving & undamaged & very low \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Correlation matrix defining the different levels of risk. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Combination** & **Landslide** & \
\begin{tabular}{c} **Susceptibility** \\ **Index** \\ \end{tabular} & **Velocity** &
\begin{tabular}{c} **Damage** \\ **Severity Level** \\ \end{tabular} & **Attention** \\ \hline
01a & no & \textgreater{}0 & moving & damaged & high \\
02a & no & \textgreater{}0 & not moving & damaged & medium \\
03a & no & \textgreater{}0 & moving & undamaged & medium \\
04a & no & \textless{}0 & moving & damaged & medium \\
05a & no & \textless{}0 & not moving & damaged & low \\
06a & no & \textgreater{}0 & not moving & undamaged & low \\
07a & no & \textless{}0 & moving & undamaged & low \\
08a & no & \textless{}0 & not moving & undamaged & very low \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Correlation matrix defining the different levels of attention required. Figure 2: Aerial photos of Vaglio Basilica (**a**,**c**) and Trivigno (**b**,**d**). (**a**,**c**) show the slow-moving landslides inventoried by the Interregional River Basin Authority of Basilica and the spatial distribution of DInSAR velocities (road sections surveyed are marked in black) within the two municipalities. (**b**,**d**) focus on the main road stretches connecting highway SS407 Basentana to the two city centers. The insets show the location of the two municipalities within the Basilica region. The mechanical processes and the displacement time evolution of the slow-moving landslides has caused, over time, widespread damage to the built-up environment interacting with them. Particularly sensitive to the landslide-induced movements are the two considered study areas, represented by the road networks connecting highway SS407 Basentana to the urban centers: 29.42 km with four main access points in Vaglio Basilicata (V01, V02, V03, and V04 in Figure 2b) and 16.93 km with two main access points in Trivigno (T01 and T02 in Figure 2d).