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Aggravation factors for 2D site effects in sedimentary basins: The case of Norcia, central Italy
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2021-06-25 , DOI: 10.1016/j.soildyn.2021.106854
R. Rodriguez-Plata , A.G. Ozcebe , C. Smerzini , C.G. Lai

In this article the seismic site response of the Norcia basin, Central Italy, has been analyzed using both 1D and 2D ground response numerical models. Period-dependent aggravation factors (PDAFs) quantifying the difference between 2D and 1D site response are provided for two representative cross-sections of the basin. Time-domain linear visco-elastic and non-linear analyses were carried out by the finite difference commercial program FLAC2D. For the former, the PDAFs were computed using a suite of representative ground motion records. Although the basin sediments are constituted by rather stiff soils, the Norcia basin is found to produce a consistent modification and enhancement of ground motion. It is found that the most important source of ground motion aggravation was the generation of Rayleigh waves at the basin edges. The variability of the PDAFs was explored by considering the effects of frequency content of input motion, damping ratio, irregularity of the alluvial-bedrock interface. The effect of the non-linear response of the sediments on the PDAFs was also addressed with reference to the Mw 5 October 30, 2016 event.



中文翻译:

沉积盆地二维场地效应的加重因素:以意大利中部诺尔恰为例

在本文中,使用一维和二维地面响应数值模型分析了意大利中部诺尔恰盆地的地震现场响应。为盆地的两个代表性横截面提供了量化二维和一维站点响应之间差异的周期相关加重因子 (PDAF)。时域线性粘弹性和非线性分析由有限差分商业程序 FLAC2D 进行。对于前者,PDAFs 是使用一套有代表性的地面运动记录计算的。尽管盆地沉积物由相当坚硬的土壤构成,但发现诺恰盆地对地面运动产生了一致的修改和增强。发现地震动加剧的最重要来源是盆地边缘瑞利波的产生。通过考虑输入运动的频率成分、阻尼比、冲积基岩界面的不规则性,探索了 PDAF 的可变性。沉积物非线性响应对 PDAF 的影响也参考 2016 年 10 月 30 日的 Mw 5 事件进行了处理。

更新日期:2021-06-25
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