Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor
Ground-motion characteristics estimated from spectral ratio between horizontal and vertical components of microtremor
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DOI：
10.1785/bssa0880010228
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发表时间：
1998-02
影响因子：
3
通讯作者：
Katsuaki Konno;T. Ohmachi
中科院分区：
文献类型：
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作者：
Katsuaki Konno;T. Ohmachi
地表微动水平分量和垂直分量的频谱比(H/V比)已被用来估计场地的基本周期和放大系数，尽管这项技术缺乏理论依据。本文的目的是根据瑞利波和乐夫波的特点来阐述H/V技术，以期对该技术的改进有所贡献。改进不仅包括使用H/V比中的波峰和波谷来可靠地估计周期，还包括使用新提出的平滑函数来更好地估计放大系数。该公式得到了用H/V比表示的放大系数的简单公式。利用东京23个区546所初中的微震测量数据，将改进后的技术应用于绘制该地区的场地周期和放大系数。
The spectral ratio between horizontal and vertical components (H/V ratio) of microtremors measured at the ground surface has been used to estimate fundamental periods and amplification factors of a site, although this technique lacks theoretical background. The aim of this article is to formulate the H/V technique in terms of the characteristics of Rayleigh and Love waves, and to contribute to improve the technique. The improvement includes use of not only peaks but also troughs in the H/V ratio for reliable estimation of the period and use of a newly proposed smoothing function for better estimation of the amplification factor. The formulation leads to a simple formula for the amplification factor expressed with the H/V ratio. With microtremor data measured at 546 junior high schools in 23 wards of Tokyo, the improved technique is applied to mapping site periods and amplification factors in the area.