## 3 Results
### Integration between Social Vulnerability, Single-Hazard, and Multi-Hazard Classes  
As a final result, Figure 11 represents the outcomes derived from the combination of SVI classes (Figure 9) and hazard classes (Figures 7 and 8) at the3 census tract level. In particular, the maps provide information about the product between LH and SVI (green scale), FH and SVI (blue scale), and MH and SVI (violet scale). Census tracts falling in the green scale represent areas with different levels of social vulnerability only exposed to different levels of landslide hazard, census tracts related to the blue scale outline areas with different levels of social vulnerability only exposed to different levels of flood hazard, and census tracts associated corresponding to the violet scale show areas with different levels of social vulnerability exposed to different levels of multi-hazard (flood and landslide). The details of this type of classification are presented in Table 4, where quantitative and qualitative information derived from the entire analysis are provided for each municipality. Looking at the general final map (Figure 11) and Table 7, 14 census tracts correspond with the population with the high class of social vulnerability to landslide hazards in the municipalities of Craco, Montescaglioso, Pisticci, and Tursi; 16 census tracts are related to flood hazards in the municipality of Bernalda and Nova Siri; 6 census tracts fall in the multi-hazard context within the municipality of Craco, Montalbano Jonico, Montescaglioso, and Pisticci. \begin{table}
\begin{tabular}{c c c c c c} \hline \multirow{2}{*}{**Municipality**} & **Low MH** & \multirow{2}{*}{**MH Code**} & **Medium MH** & \multirow{2}{*}{**MH Code**} & **High MH** & \multirow{2}{*}{**MH Code**} \\  & **(Class 2-4)** & & **(Class 5)** & & **(Class 6-8)** & \\ \hline BERNALDA & 2 & MH5, MH8 & 0 & & 0 \\ COLOBRARO & 5 & MH3, MH6, MH9, MH13 & 0 & & 3 \\ CRACO & 6 & MH5, MH9, MH11 & 0 & & 7 & MH5, MH8, MH9 \\ MONTALBANO & 4 & MH4, MH8, MH11, MH14 & 0 & & 3 & MH5 \\ MONTESCAGLK & 5 & MH9, MH10, MH12 & 0 & & 0 & \\ NOVA SIRI & 4 & MH5, MH9, MH13 & 0 & & 0 & \\ PISTICCI & 20 & MH5, MH8, MH14 & 3 & MH5, MH8, MH14 & 19 & MH4, MH5, MH8, MH15 \\ POMARICO & 5 & MH9, MH11, MH14 & 2 & MH11, MH13 & 1 & MH5 \\ ROTONDELLA & 2 & MH11, MH14 & & & & \\ SCANZANO & 2 & MH5 & 0 & & 0 & \\ JONICO & & MH1, MH5, MH8, MH9, MH12, MH14, MH15, & & & \\ VALSINNI & 5 & MH14 & 2 & MH7, MH10 & 2 & MH7, MH13 \\ \hline \end{tabular}
\end{table} 
Table 6: Table showing the number of census tracts exposed to different multi-hazard classes in the case of LH + FH (MPH) for each municipality affected by MH. The columns related to “MH Code” show the type of multi-hazard derived from the qualitative investigation for each semi-quantitative level. The shades of violet represent the different levels of multi-hazard, in correlation with Figure 8.  
Figure 10: Histogram showing the number of census tracts with their relative levels of social vulnerability for each municipality under investigation. Figure 9: Spatial distribution of the SVI class based on eq.1 at the census tract level: 1 = very low social vulnerability; 2 = low social vulnerability; 3 = medium social vulnerability; 4 = high social vulnerability; 5 = very high social vulnerability. Basemap: Google Satellite. Figure 11: Spatial distribution of the census tracts based on the overlap between the SVI and landslide hazard (LH), the SVI and flood hazard (FH), and the SVI and multi-hazard (MH) events in different return period scenarios: 20–50 years (a), and 100–200 and 500 years (b). Basemap: Google Satellite.