In this work, we assess ground shaking in the wider Zagreb area by computing simulated seismograms at regional distances. For the purposes of the simulations, we assemble the 3D velocity and density model and test its performance. First, we compare the low-frequency simulations obtained using deterministic method for both new 3D model and a simple 1D model. We then continue the performance test by computing the full broadband seismograms. To do that, we apply the hybrid technique in which the low frequency (f < 1 Hz) and high frequency (f = 1–10 Hz) seismograms are obtained separately using deterministic and stochastic method, respectively, and then reconciled into a single time series. We apply this method to the M_W = 5.3 event and four smaller (3.0 < M_W < 5.0) events that occurred in the studied region. We compare simulated data with the recorded seismograms and validate our results by calculating the goodness of fit score for peak ground velocity and shaking duration. Next, to improve the understanding of the strong ground motion in this area, we simulate seismic shaking scenarios for the 1880, M_W = 6.2 earthquake. From computed low-frequency waveforms, we generate shakemaps and compare the ground-motion features of the two possible sources of this event, Kašina fault and North Medvednica fault. We conduct a preliminary study to determine which fault is a more probable source of the 1880 historic event by comparing the peak ground velocities and Arias intensity with the observed intensities.

在这项工作中，我们通过计算区域距离的模拟地震图来评估更广泛的萨格勒布地区的地面震动。出于模拟的目的，我们组装了 3D 速度和密度模型并测试其性能。首先，我们比较了针对新 3D 模型和简单 1D 模型使用确定性方法获得的低频模拟。然后我们通过计算完整的宽带地震图继续进行性能测试。为此，我们应用混合技术，其中 分别使用确定性和随机方法分别获得低频 ( f  < 1 Hz) 和高频 ( f = 1-10 Hz) 地震图，然后将其调和为单个时间系列。我们将此方法应用于 M _W  = 5.3 事件和四个较小的 (3.0 < M_W  < 5.0) 发生在研究区域的事件。我们将模拟数据与记录的地震图进行比较，并通过计算峰值地速和震动持续时间的拟合优度来验证我们的结果。接下来，为了更好地了解该地区的强地震动，我们模拟了 1880 年 M _W  = 6.2 地震的地震震动场景。根据计算出的低频波形，我们生成了振动图并比较了该事件的两个可能来源，Kašina 断层和 North Medvednica 断层的地面运动特征。我们进行了一项初步研究，通过比较峰值地面速度和 Arias 强度与观察到的强度，确定哪个断层更可能是 1880 年历史事件的来源。