This research presents an updated scheme of simulation for strong ground motions based on stochastic summation methods and the source-to-site attenuation effects under particular soil conditions different from firm sites. Two approaches are proposed to modify and improve the empirical Green’s functions at different source distances from seismic station records: (1) a spectral shape based on far-field point-source spectra models and (2) through specific ground motion prediction equations (GMPEs) and random vibration theory (RVT). The ground motions simulated were compared with the September 19, 2017 Mexico records (normal-fault-intraslab event, Mw 7.1), finding that for soft soils, it will be possible to reproduce some characteristic of spectral peaks appropriately in high frequency compared with available similar approaches or using one-dimensional wave propagation models. On average, the spectral overestimations from available simulation approaches and for high-frequency bandwidth (i.e., 0.2 s and 0.3 s) can be reduced by a factor between 2 and 5 using proper attenuation corrections; this effect could be especially beneficial for small structures and low-rise buildings where the inertial design forces will be potentially reduced.

中文翻译：

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在特定土壤条件下通过衰减效应修正的强地面运动的模拟：模拟2017年墨西哥普埃布拉（Mw 7.1）地震

这项研究提出了一种基于随机求和方法的强地面运动仿真更新方案，以及在不同于坚固场地的特定土壤条件下，源到场地的衰减效应。提出了两种方法来修改和改进距地震台站记录的不同源距离处的格林经验函数：（1）基于远场点源谱模型的谱形状；（2）通过特定的地面运动预测方程（GMPE）和随机振动理论（RVT）。我们将模拟的地面运动与2017年9月19日的墨西哥记录（正常断层间事件，Mw 7.1）进行了比较，发现对于软土，与可用的类似方法或使用一维波传播模型相比，有可能在高频下适当地再现频谱峰值的某些特征。平均而言，使用适当的衰减校正，可以将可用仿真方法的频谱高估和高频带宽（即0.2 s和0.3 s）的频谱高估降低2到5倍。对于可能减小惯性设计力的小型结构和低层建筑，此效果可能特别有益。