## 4 Results and Discussion  
### Relationships between Landslides and the Related Factors  
By calculating the frequency ratios (FR), the probability of landslides occurring within the different classifications of each influencing factor can be obtained. FR values can effectively indicate the correlation between landslides and various influencing factors. Table 1 displays the FR values for all influencing factors examined in this study. Values greater than 1 indicate a stronger correlation and a higher probability of a landslide occurring [51]. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Factors** & **Class** & **Percentage of Domain \%** & **Percentage of Landslides \%** & **FR** \\ \hline \multirow{4}{*}{Elevation} & \(<\)941 & 21.15 & 4.39 & 0.21 \\  & 941–1193 & 17.88 & 52.63 & 2.94 \\  & 1193–1416 & 28.53 & 33.33 & 1.17 \\  & 1416–1664 & 25.15 & 8.77 & 0.35 \\  & \(>\)1664 & 7.29 & 0.88 & 0.12 \\ \hline \multirow{4}{*}{Slope} & \(<\)3 & 25.27 & 17.54 & 0.69 \\  & 3–6 & 20.97 & 23.68 & 1.13 \\ \cline{1-1}  & 6–9 & 21.17 & 32.47 & 1.53 \\ \cline{1-1}  & 9–13 & 19.84 & 20.18 & 1.02 \\ \cline{1-1}  & \(>\)13 & 12.76 & 6.14 & 0.48 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: The spatial relationships among landslide conditioning factors. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Factors** & **Class** & **Percentage of Domain \%** & **Percentage of Landslides \%** & **FR** \\ \hline \multirow{4}{*}{Distance to rivers} & \textless{}500 & 12.68 & 24.56 & 1.94 \\  & 500–1000 & 12.01 & 14.91 & 1.24 \\  & 1000–1500 & 11.29 & 8.77 & 0.78 \\  & 1500–2000 & 10.44 & 8.77 & 0.84 \\  & \textgreater{}2000 & 53.58 & 42.98 & 0.80 \\ \hline \multirow{4}{*}{Distance to roads} & \textless{}800 & 28.81 & 39.47 & 1.37 \\  & 800–1600 & 21.20 & 21.93 & 1.03 \\  & 1600–2400 & 15.59 & 16.67 & 1.07 \\  & 2400–3200 & 11.44 & 10.53 & 0.92 \\  & \textgreater{}3200 & 22.97 & 11.40 & 0.50 \\ \hline \multirow{4}{*}{Slope aspect} & Flat & 6.01 & 4.39 & 0.73 \\  & North & 11.21 & 6.14 & 0.55 \\  & Northeast & 12.17 & 11.40 & 0.94 \\  & East & 11.93 & 13.16 & 1.10 \\  & Southeast & 12.51 & 20.18 & 1.61 \\  & South & 12.19 & 12.28 & 1.01 \\  & Southwest & 12.01 & 14.04 & 1.17 \\  & West & 10.76 & 6.14 & 0.57 \\  & Northwest & 11.20 & 12.28 & 1.10 \\ \hline \multirow{4}{*}{SPI} & \textless{}3 & 31.14 & 4.39 & 0.14 \\  & \textless{}3–1.5 & 33.80 & 6.14 & 0.18 \\  & 1.5–2.5 & 27.36 & 34.21 & 1.25 \\  & 2.5–4.5 & 7.70 & 47.37 & 6.15 \\  & \textgreater{}4.5 & 6.64 & 7.89 & 1.19 \\ \hline \multirow{4}{*}{TWI} & \textless{}5 & 20.52 & 21.93 & 1.07 \\  & 5–7 & 41.09 & 42.11 & 1.02 \\  & 7–12 & 27.87 & 27.19 & 0.98 \\  & 12–17 & 6.39 & 5.26 & 0.82 \\  & \textgreater{}17 & 4.13 & 3.51 & 0.85 \\ \hline \multirow{4}{*}{NDVI} & \textless{}0.15 & 25.70 & 28.95 & 1.13 \\  & 0.15–0.23 & 30.51 & 42.11 & 1.38 \\  & 0.23–0.28 & 27.59 & 21.05 & 0.76 \\  & 0.28–0.36 & 9.96 & 7.02 & 0.70 \\  & \textgreater{}0.36 & 6.23 & 0.88 & 0.14 \\ \hline \multirow{4}{*}{Plan curvature} & \textless{}0.7 & 5.33 & 1.75 & 0.33 \\  & \textless{}0.7—0.3 & 15.33 & 27.19 & 1.77 \\  & \textgreater{}0.3–0.02 & 43.05 & 43.86 & 1.01 \\  & 0.02–0.6 & 36.29 & 24.56 & 0.68 \\  & \textgreater{}0.6 & 5.75 & 2.63 & 0.46 \\ \hline \multirow{4}{*}{Surface cutting depth} & \textless{}3.5 & 29.12 & 21.05 & 0.72 \\  & 3.5–6 & 17.13 & 23.68 & 1.38 \\  & 6–9.5 & 20.77 & 29.82 & 1.44 \\  & 9.5–12.5 & 15.58 & 12.28 & 0.79 \\  & \textgreater{}12.5 & 17.40 & 13.16 & 0.76 \\ \hline \multirow{4}{*}{Terrain roughness} & \textless{}1.01 & 38.83 & 32.46 & 0.84 \\  & 1.01–1.03 & 16.07 & 21.93 & 1.36 \\  & 1.03–1.11 & 17.50 & 26.32 & 1.50 \\  & 1.11–1.16 & 15.21 & 13.16 & 0.86 \\  & \textgreater{}1.16 & 12.39 & 6.14 & 0.50 \\ \hline \multirow{4}{*}{Terrain relief} & \textless{}7 & 26.96 & 18.42 & 0.68 \\  & 7–11.5 & 16.42 & 16.67 & 1.01 \\ \cline{1-1}  & 11.5–18.5 & 22.55 & 37.72 & 1.67 \\ \cline{1-1}  & 18.5–28 & 20.18 & 21.05 & 1.04 \\ \cline{1-1}  & \textgreater{}28 & 13.90 & 6.14 & 0.45 \\ \hline \end{tabular}
\end{table}