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Two-stage nonlinear site amplification modeling for Japan with VS30 and fundamental frequency dependency
Earthquake Spectra ( IF 5 ) Pub Date : 2020-06-01 , DOI: 10.1177/8755293020907920
Dong Youp Kwak 1 , Emel Seyhan 2
Affiliation  

We describe a two-stage nonlinear site amplification model that considers both the sediment depth and the fundamental frequency of the soil. Adopting a non-reference site approach, empirical site amplification ratios for 1591 Kyoshin and Kiban Kyoshin network sites are developed. This process involves analyzing 92,025 surface ground motion recordings from 305 earthquakes between 1997 and 2012. The model is developed in two stages: first, we regress the total empirical site effects in terms of VS30; second, we fit a functional form to the residuals from the first stage using the fundamental period of the site. We validate the model through residual analyses and statistical methods. This study shows that the peak soil period increases with the equivalent shear strain (Iγ), while the peak amplitude decreases with Iγ. The first-stage site term reduces the error at mid-to-long period ranges (>0.1 s) by 0.11 from the error of the initial site term without any constraints. The second-stage site term reduces the error further as 0.06. Finally, we discuss the model limitations and the applicability range of the predictor variables.

中文翻译:

具有 VS30 和基频相关性的日本两级非线性站点放大建模

我们描述了一个两阶段非线性场地放大模型,该模型考虑了沉积物深度和土壤的基频。采用非参考站点方法,开发了 1591 个 Kyoshin 和 Kiban Kyoshin 网络站点的经验站点放大率。该过程涉及分析 1997 年至 2012 年间 305 次地震的 92,025 个地表运动记录。该模型分两个阶段开发:首先,我们根据 VS30 回归总经验场地效应;其次,我们使用场地的基本周期为第一阶段的残差拟合函数形式。我们通过残差分析和统计方法验证模型。该研究表明,峰值土壤周期随着等效剪应变(Iγ)而增加,而峰值振幅随着 Iγ 减小。第一阶段站点项在没有任何约束的情况下将中长期范围(> 0.1 s)的误差从初始站点项的误差减少了0.11。第二阶段站点项将误差进一步降低为 0.06。最后,我们讨论了模型的局限性和预测变量的适用范围。
更新日期:2020-06-01
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