# 2-D Seismic Response Analysis of a Slope in the Tyrrhenian Area (Italy)
## 3 Site Response Analysis
### 1-D Analysis  
For complex geometries, it is very important to perform dynamic analyses by different codes, and in particular through 2-D codes that can catch some aspects that 1-D codes cannot catch.  
The 1-D analyses performed by EERA and QUAKE/W codes, for the seven inputs, show similar values of PGA for points 1 and 2 (behind the crest point and crest point) [39]. The following figures show in red and blue, respectively, the EERA and QUAKE/W results in terms of acceleration time history and spectral acceleration. In particular, Figures 13-15 show the 1-D analysis results for the [PERSON] et al. [26] input, and the results have been summarized in the Table 5. Results obtained for points 1 and 2 show values of the stratigraphic soil amplification factor of about 1.30 using the EERA code and of about 1.20 using the QUAKE/W code. For point 3, there is no significant stratigraphic soil amplification.  
Figure 12: Cross-section and location of the three monitored points.  
Figure 14: Comparison between 1-D analyses performed by EERA and QUAKE/W for point 2, in terms of acceleration time history and spectral acceleration, for the [PERSON] et al. [26] input.  
Figure 13: Comparison between 1-D analyses performed by Equivalent-Linear Earthquake Site Response Analysis (EERA) and QUAKE/W for point 1, in terms of acceleration time history and spectral acceleration, for the [PERSON] et al. [26] input.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**[PERSON] et al. [25]**} & \multicolumn{2}{c}{**[PERSON] et al. [24]**} & \multicolumn{2}{c}{**DISS Messina Strait**} \\ \hline  & **PGA** & **PGA** & **PGA** & **PGA** & **PGA** \\  & **eera** & **QUake/w1-d** & **eera** & **QUakew i-d** & **eera** & **QUake/w 1-d** \\  & **[g]** & **[g]** & **[g]** & **[g]** & **[g]** & **[g]** \\ \hline Point 1 & 0.208 & 0.193 & 0.208 & 0.156 & 0.195 & 0.269 \\ Point 2 & 0.208 & 0.193 & 0.208 & 0.156 & 0.195 & 0.269 \\ Point 3 & 0.176 & 0.147 & 0.184 & 0.152 & 0.165 & 0.151 \\ \hline \multicolumn{5}{c}{_DISS Gioia Tauro_} & \multicolumn{2}{c}{_DISS Aspromonte Est_} & _1693 Catania Earthquake_ \\ \hline  & **PGA** & **PGA** & **PGA** & **PGA** & **PGA** \\  & **eera** & **QUake/w1-d** & **eera** & **QUakew i-d** & **eera** & **QUake/w 1-d** \\  & **[g]** & **[g]** & **[g]** & **[g]** & **[g]** & **[g]** \\ \hline Point 1 & 0.257 & 0.203 & 0.206 & 0.266 & 0.179 & 0.142 \\ Point 2 & 0.257 & 0.203 & 0.206 & 0.266 & 0.179 & 0.142 \\ Point 3 & 0.202 & 0.157 & 0.181 & 0.167 & 0.154 & 0.117 \\ \hline \hline \end{tabular}
\end{table}
Table 6: PGA by 1-D analyses for the [PERSON] et al. [24], [PERSON] et al. [25], DISS Messina Strait, DISS Gioia Tauro, DISS Aspromonte Est, 1693 Catania earthquake inputs at point 1, 2 and 3.  
Figure 15: Comparison between 1-D analyses performed by EERA and QUAKE/W for point 3, in terms of acceleration time history and spectral acceleration, for the [PERSON] et al. [26] input.  
\begin{table}
\begin{tabular}{c c c} \hline \hline  & \multicolumn{2}{c}{**PGA\({}_{\text{EERA}}\)**} & \multicolumn{2}{c}{**PGA\({}_{\text{QUAKE/W i-d}}\)**} \\  & **[g]** & **[g]** \\ \hline Point 1 & 0.228 & 0.207 \\ Point 2 & 0.228 & 0.207 \\ Point 3 & 0.168 & 0.141 \\ \hline \hline \end{tabular}
\end{table}
Table 5: PGA (Peak Ground Acceleration) by 1-D analyses for the [PERSON] et al. [26] input at point 1, 2 and 3.  
Results obtained for points 1 and 2, show maximum values of the stratigraphic soil amplification factor of about 1.45 using EERA code and of about 1.50 using QUAKE/W code. While for point 3 results show a slight stratigraphic soil amplification of about 1.10.