## 5 Conclusions  
This paper provides seismic peak ground acceleration prediction equations tailored to the East Anatolian Fault Zone. These results can be valuable for seismic hazard assessments, the seismic-resistant design of significant engineering projects, and seismic risk evaluation in the southeastern region of Turkiye. The PGA and EPA prediction equations and attenuation characteristics of the Pazarcik M\({}_{w}\)7.7 earthquake in Turkiye were investigated and the following conclusions were drawn:  
1. The PGA values were higher than the EPA values for the same fault distance, both in the vertical and horizontal directions. On average, the PGA was approximately 1.4 to 1.5 times larger than the EPA. When considering the impact of seismic parameters on damage assessment, it is recommended to use EPA values to reduce PGA variability and to improve reliability. 2. The PGA exhibited certain vertical effects near the fault, while the EPA did not show this phenomenon. Through the comparison of multiple sets of vertical and horizontal data, we found that the estimation of vertical seismic action as two-thirds of the horizontal seismic action was reasonable. Based on the analysis of Pazarcik earthquake data, this estimation had a reliability of over 85%. For engineering design considerations, the vertical seismic action can also be estimated as half of the horizontal seismic action for far-field cases. 3. There were significant differences in the attenuation relationship between the PGA and EPA for different site types. The amplification effect of PGA in soil sites compared to that in bedrock sites was more pronounced horizontally than vertically. Taking PGA in bedrock sites as a reference, the average amplification factor for horizontal soil sites was 1.46, while for vertical soil sites, it was 1.12. The soil amplification effect was related to the fault distance, with a greater amplification effect observed in the horizontal PGA as the fault distance increased, while the vertical effect exhibited the opposite trend. 4. For fault distances greater than 5 km, the PGA of the Wenchuan earthquake was consistently larger than that of the Pazarcik earthquake for the same fault distance. As the fault distance increased, the ratio between the PGA predicted values of the Wenchuan and Pazarcik earthquakes gradually increased from 1.0 to 3.60. For fault distances smaller than 5 km, the PGA attenuation curves of the Wenchuan and Pazarcik earthquakes were almost similar. This comparison indicated that the seismic damage range caused by the Wenchuan earthquake was much larger than that caused by the Pazarcik earthquake. 5. Due to the concentration of strong motion data in Class II sites, there was a limited amount of available data for Class I and Class III sites. Specifically, the distribution of bedrock data within a fault distance of 0-50 km was uneven. Therefore, further data verification and in-depth research are needed to examine the influence of site types on attenuation characteristics. This study focused on a single seismic event, and thus, the developed ground motion prediction equations have a limited range of applicability. Future research should make full use of the strong-motion records from multiple seismic events in the Turkish strong-motion network. This should be achieved through the inclusion of the earthquake magnitude as a variable in regression fitting to establish ground motion prediction equations by incorporating source parameters, distance parameters, and site parameters. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Type** & **A** & **B** & **C** & **Adjusted** \\  & & & **R-Square** \\ \hline Wenchuan & & & & \\ Earthquake & 4.842 \(\pm\) 0.345 & \(-\)0.000329 \(\pm\) 0.00441 & \(-\)1.3204 \(\pm\) 0.186 & 0.99074 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Coefficients of horizontal PGA prediction equation. **Author Contributions:** Conceptualization, J.B. and W.W.; methodology, W.W.; software, D.P. ; validation, Y.D. ; formal analysis, Q.L.