# Geo-Proxy-Based Site Classification for Regional Zonation of Seismic Site Effects in South Korea
## 3 Development of Site Classification with Geo-Proxies Using Geotechnical Database in Seoul
### Framework for Site Classification Based on Geo-Proxy in South Korea
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Criteria**} & \multicolumn{3}{c}{**Proxies**} \\ \cline{2-7}
**Site Class** & \(V_{\text{530 (m/s)}}\) & \(T_{G}\) **(s)** & \(f_{\text{0}}\) **(Hz)** & \multicolumn{2}{c}{**Slope,** \(Sp\) **(m/m)**} & \multicolumn{2}{c}{**Elevation,** \(Ev\) **(m)**} \\ \cline{3-7}  & & & & **Stable Contient [15]** & **South Korea (Proposed in This Study)** & **South Korea (Proposed in This Study)** \\ \hline B & \textgreater{}760 & \textless{}0.06 & \textgreater{}16.67 & \textgreater{}0.025 & \textgreater{}0.056 & \textgreater{}80 \\  & \textgreater{}620 & \textless{}0.10 & \textgreater{}10.00 & \textgreater{}0.018 & \textgreater{}0.002 & \textgreater{}52 \\ C & \textgreater{}520 & \textless{}0.14 & \textgreater{}7.14 & \textgreater{}0.013 & \textgreater{}0.001 & \textgreater{}33 \\  & \textgreater{}360 & \textless{}0.29 & \textgreater{}3.45 & \textgreater{}0.0072 & \textgreater{}0.0062 & \textgreater{}22 \\  & \textgreater{}320 & \textless{}0.38 & \textgreater{}2.63 & \textgreater{}0.004 & \textgreater{}0.0026 & \textgreater{}16 \\ D & \textgreater{}280 & \textless{}0.46 & \textgreater{}2.17 & \textgreater{}0.002 & \textgreater{}0.0016 & \textgreater{}12 \\  & \textgreater{}180 & \textless{}0.62 & \textgreater{}1.61 & \textgreater{}0.00002 & \textgreater{}0.00006 & \textgreater{}9 \\ E & \textless{}180 & \textgreater{}0.62 & \textless{}1.61 & \textless{}0.00002 & \textless{}0.00006 & \textless{}9 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Existing and proposed systems for site classification based on the proxy of surface slope. Figure 8: Geo-proxy-based empirical preliminary classification for each site classification condition according to \(f_{\text{0}}\) (\(T_{G}\)) in Seoul: (**a**) surface terrain slope; (**b**) surface elevation. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Generic Description**} & \multirow{2}{*}{**Site Class**} & \multicolumn{3}{c}{**Criteria**} & \multicolumn{3}{c}{**Geo-Proxies**} \\ \cline{3-8}  & & \(V_{\text{530 (m/s)}}\) & \(T_{G}\) **(s)** & \(f_{\text{0}}\) **(Hz)** & \multicolumn{2}{c}{**Slope,** \(Sp\)**} & \multicolumn{2}{c}{**Elevation,** \(Ev\) **(m)**} \\ \hline
**Rock** & B & \textgreater{}760 & \textless{}0.06 & \textgreater{}16.67 & \textgreater{}0.056 & \textgreater{}80 \\ \hline
**Weathered Rock and** & & C1 & \textgreater{}620 & \textless{}0.10 & \textgreater{}10.00 & \textgreater{}0.035 & \textgreater{}60 \\
**Very Stiff Soil** & C & C2 & \textgreater{}520 & \textless{}0.14 & \textgreater{}7.14 & \textgreater{}0.02 & \textgreater{}45 \\ \hline
**Intermediate Stiff Soil** & & C3 & \textgreater{}440 & \textless{}0.20 & \textgreater{}5.00 & \textgreater{}0.011 & \textgreater{}31 \\  & & C4 & \textgreater{}360 & \textless{}0.29 & \textgreater{}3.45 & \textgreater{}0.0062 & \textgreater{}22 \\ \hline \hline \multirow{4}{*}{**Deep Stiff Soil**} & & D1 & \textgreater{}320 & \textless{}0.38 & \textgreater{}2.63 & \textgreater{}0.0023 & \textgreater{}18 \\  & & D2 & \textgreater{}280 & \textless{}0.46 & \textgreater{}2.17 & \textgreater{}0.0008 & \textgreater{}14 \\ \cline{1-1}  & & D3 & \textgreater{}240 & \textless{}0.54 & \textgreater{}1.85 & \textgreater{}0.00023 & \textgreater{}11 \\ \cline{1-1}  & & D4 & \textgreater{}180 & \textless{}0.62 & \textgreater{}1.61 & \textgreater{}0.00006 & \textgreater{}9 \\ \hline
**Deep Soft Soil** & & E & \textless{}180 & \textgreater{}0.62 & \textless{}1.61 & \textless{}0.00006 & \textless{}9 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Geo-proxy-based empirical site classification proposal according to the slope and elevation for domestic application.