## 4 Discussion and Conclusions
[PERSON] and [PERSON] [23] compared the observed PGA and simulated PGA distributions of 1671 accelerograms from the main-shocks and aftershocks of the Wenchuan \(M_{\text{S}}\) 8.0 earthquake recorded at 50 strong-motion observational stations. They found that the observed PGAs of the MZQ station located near the second-largest asperity of the Longmen Shan fault were larger than those for the SFB station, which was near the largest asperity. This result indicates that our conclusion is consistent with an actual strong earthquake. In Figure 9a,b, we can see that Site 1 and Site 2 at point 1 for Slip Model 1 are relatively close, constituting the highest results of all the schemes. However, for Slip Model 2, the results for Site 1 at different points are lower than those of Site 2. Although the depth of the initial rupture point had limited impact on the ground motion parameters, the relationship between its location on the rupture plane and the distribution of the asperities and site locations had a significant impact on the results. Therefore, this relationship requires careful consideration in near-field ground motion simulations for large earthquakes. How to reasonably determine a source model and whether to choose a random source model need to be considered when simulating the ground motion parameters for near-field strong ground motion at major infrastructure sites. As mentioned in Section 2, we have provided a detailed description for the selection of ground motion modeling parameters, including the maximum credible earthquake, fault length, fault width, fault dip angle, inclination, high-frequency attenuation (\(\kappa_{0}\)), quality factor (\(Q(f)\)), site amplification factor, etc. We fixed other parameters and considered the uncertainty of the dip angle, stress drop, kappa, and initial rupture point in our multi-scheme ground motion simulation. We did not consider the uncertainty of other parameters, which does not mean that these parameters are not important. On the contrary, the determination of these parameters determines whether the evaluation of ground motion parameters is reasonable, so we described the selection of each parameter earlier. [PERSON] et al. [19] and [PERSON] et al. [20] used the stochastic finite-fault method to analyze the effect of the uncertainty of fault dip angle, stress drop, and kappa. The results presented in [19] showed that the PGA values increased with the increase in stress drop and the decrease in kappa. [PERSON] et al. [20] found that the closer the dip angle is to 90\({}^{\circ}\), the larger the rupture distance and the higher the simulated results obtained. So, we did not discuss these parameters' uncertainties in the results and instead focused on the effect of the initial rupture point, site location, source model, and their weights on the simulation results. Of course, multi-scheme ground motion simulations can also consider the uncertainty of other modeling parameters, such as fault length and fault width. However, as these parameters change, the maximum credible earthquake magnitude and slip model will also change, making the calculations more complex. This issue poses challenges for multi-scheme ground motion simulation, so we need to conduct further research on this aspect. Our motivation was mainly related to major infrastructure. However, a reliable estimation of ground motion input is also important for common structures belonging to the building stock. We usually use seismic hazard maps to guide the seismic hazard assessment of common structures in China. Since the multi-scheme method is not only applicable to major infrastructure but also to common structures, we can extend the applications of the multi-scheme method in seismic hazard assessment to more engineering structures. The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app14041451/s1](https://www.mdpi.com/article/10.3390/app14041451/s1)]([https://www.mdpi.com/article/10.3390/app14041451/s1](https://www.mdpi.com/article/10.3390/app14041451/s1)).