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A Numerical Experiment on the Horizontal to Vertical Spectral Ratio in Flat Sedimentary Basins

机译：平坦沉积盆地水平与垂直光谱比的数值实验

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— In this paper we study the seismic response of flat sedimentary basins and carry out numerical experiments to determine the extent to which we could go using the Horizontal to Vertical Spectral Ratio (HVSR) for a given site. The HVSR has been used by many researchers to characterize local conditions in terms of the dynamic response of the soil, and one of its variants, that proposed by NAKAMURA (1989) in which records of microtremors are used, is one of the most applied in recent years. We study the response of different configurations under incident waves coming from an explosive source using the Indirect Boundary Element Method (IBEM), and we investigate two cases: low- and high-velocity contrast. We compute the seismic response using the HVSR technique at various locations in the free surface of the basins, and compare it with the response calculated with the horizontal Sediment to Bedrock Spectral Ratio (SBSR) and with the Horizontal Component (HC) of the transfer function for the displacement at the same locations. The comparison shows that, in general, HVSR cannot provide the predominant period of a site due to the fact that this technique cannot predict accurately the Spectral amplification levels. On the other hand, the HVSR provides an erroneous response in the sedimentary basins which have a low-impedance contrast, with respect to bedrock, and with shape ratios like the one studied here, whereas it can reasonably well predict the fundamental local frequency when there is a high-impedance contrast, except in the center of the basin.
机译：—在本文中，我们研究了平坦沉积盆地的地震响应，并进行了数值实验，以确定在给定地点使用水平与垂直光谱比（HVSR）可以达到的程度。 HVSR已被许多研究人员用来根据土壤的动态响应来表征当地条件，而NAKAMURA（1989）提出的其中一种使用微震记录的变体是其中最广泛的应用之一。最近几年。我们使用间接边界元方法（IBEM）研究了来自爆炸源的入射波对不同构型的响应，并研究了两种情况：低速和高速对比。我们使用HVSR技术在盆地自由表面的各个位置计算地震响应，并将其与通过水平沉积物与基岩光谱比（SBSR）和传递函数的水平分量（HC）计算得到的响应进行比较在相同位置的位移。比较表明，由于该技术无法准确预测频谱放大水平，因此HVSR通常无法提供站点的主要时段。另一方面，HVSR在沉积盆地中提供了错误的响应，这些沉积盆地相对于基岩具有低阻抗对比，并且形状比与此处研究的形状比相同，但是当沉积在盆地中时，它可以合理地预测基本局部频率是高阻抗对比，但在盆中心除外。

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