Characterizing the Vertical-to-Horizontal Ratio of Ground Motion at Soft-Sediment Sites
Characterizing the Vertical-to-Horizontal Ratio of Ground Motion at Soft-Sediment Sites
复制标题
表征软沉积物场地地震动的垂直与水平比
DOI：
10.1785/0120120039
复制
发表时间：
2012
影响因子：
3
通讯作者：
D. Fäh
中科院分区：
文献类型：
--
作者：
V. Poggi;B. Edwards;D. Fäh
之前的文章已经建立了一个预测方程来获得岩石场地地震动的垂直与水平比（V/H）。该方法基于傅里叶 V/H 与离散频率下四分之一波长平均速度的地震反应谱的比较。我们扩展了这种方法来解释软沉积物地点的共振现象。为此，定义了一个新参数并将其包含在与 V/H 谱的比较中。新参数直接从四分之一波长速度导出，代表现场频率相关的地震阻抗对比。我们表明，在这个三维空间中扩展相关性有利于重建软沉积物位置（V S 30<800 m/s）的 5% 阻尼响应谱的 V/H，对于该位置，剪切波速度剖面可用。在本研究中，我们分析了日本 KiK-net 强运动网络的 220 个站点。这些站点是通过比较从录音估计的基频和间接建模方法从整个网络中选择的。根据分析，建立了两种类型的预测方程，第一种基于频率相关性，第二种基于频率无关相关性。这些随后可用于在具有已知剪切波速度剖面的任何地点重建 V/H 谱。对于这两个方程，提供了 V/H 模型的不确定性，并提出了对幅度-距离依赖性的敏感性研究。最后，我们展示了该模型在瑞士地震台网四个选定的软沉积物站点的应用示例。
A predictive equation to obtain the vertical‐to‐horizontal ratio (V/H) of ground motion for rock sites has been established in a previous article. The method was based on the comparison between V/H of Fourier and response spectra of earthquakes with the quarter‐wavelength average velocity at discrete frequencies. We extend this approach to account for resonance phenomena at soft‐sediment sites. In order to do so, a new parameter is defined and included in the comparison with the V/H spectra. The new parameter is directly derived from the quarter‐wavelength velocity and represents the frequency‐dependent seismic impedance contrast at the site. We show that extending the correlation in this three‐dimensional space is beneficial to reconstruct V/H of the 5%‐damped response spectra at soft‐sediment sites ( V S 30<800 m/s) for which a shear‐wave velocity profile is available. In this study we analyze 220 sites of the Japanese KiK‐net strong‐motion network. These sites were selected from the entire network through comparison of the fundamental frequencies estimated from the recordings and by indirect modeling methods. From the analysis, two types of predictive equations are then established, the first based on frequency‐dependent and the second on frequency‐independent correlations. These can subsequently be used to reconstruct the V/H spectrum at any site with a known shear‐wave velocity profile. For both equations, uncertainties of the V/H models are provided, and a sensitivity study to magnitude–distance dependence is presented. Finally, we show an example of the application of the model at four selected soft‐sediment sites of the Swiss Seismic Network.
影响因子：
4.5
作者：
Baker, Jack W.;Cornell, C. Allin
通讯作者：
Cornell, C. Allin
H.264编码器DCT的硬件实现及其评估
DOI：
--
发表时间：
2009
期刊：
影响因子：
--
作者：
Choong Geun Lee;V. G. Moshnyaga and K. Hashimoto;宮田康治
通讯作者：
宮田康治