Applicability of the H/V spectral ratio of microtremors in assessing site effects on seismic motion
Applicability of the H/V spectral ratio of microtremors in assessing site effects on seismic motion
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微震的 H/V 谱比在评估场地对地震运动的影响中的适用性
DOI：
10.1002/eqe.108
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发表时间：
2002
影响因子：
4.5
通讯作者：
S. Midorikawa
中科院分区：
文献类型：
--
作者：
Victor Rodriguez;S. Midorikawa
作者通过与参考场地的水平地震运动谱比的交叉验证，检查了由水平与垂直（H/V）谱比获得的场地反应估计的可靠性。资料包括横滨强震台阵150个测点的地脉动和地震动记录。非监督模式识别技术的使用旨在以更客观的方式对网站进行分组。定义扩增光谱的整体形状的属性用作计算位点之间的欧几里得距离相似性系数的输入。沃德聚类方案的实施导致实现一个有意义的树图。其分析表明，可以将结果归纳为六个一般模式。在80%的地点，地点效应估计数的良好一致性变得很明显。然而，这种一致性似乎穷人的网站，其特征是H/V放大率约2或更小，主要周期长于0.5秒。在这种情况下，土壤剖面中坚硬的桑迪沉积物的存在是常见的。为了禁止H/V估计，仅仅依靠小光谱比标准似乎是不够的。版权所有© 2001约翰威利父子有限公司。
The authors examine the reliability of site response estimations obtained by the horizontal to vertical (H/V) spectral ratios of microtremors by means of cross‐validation with the ratio of the horizontal spectra of earthquake motion with respect to reference sites. The data comprise microtremor and ground motion records recorded at 150 sites of Yokohama strong motion array. The use of non‐supervised pattern recognition techniques aims to group the sites with more objectivity. Attributes defining the overall shape of the amplification spectra serve as input in the computation of Euclidean distance similarity coefficients amongst sites. The implementation of the Ward clustering scheme leads to the attainment of a meaningful tree diagram. Its analysis shows the possibility of summarizing the results into six general patterns. A good coincidence of site effects estimates at 80 per cent of the sites becomes apparent. However, this coincidence appears poor for sites characterized by H/V amplification ratios around 2 or smaller and predominant periods longer than 0.5 s. In such cases, the presence of stiff, sandy sediments in the soil profile proves common. To proscribe H/V estimations, relying solely on the small spectral ratios criterion seems inadequate. Copyright © 2001 John Wiley & Sons, Ltd.