Simple estimation method of response characteristics in surface layer based on microtremor H/V spectral ratios

基于微动H/V谱比的地表响应特性简易估计方法

基本信息

批准号：
17560423
负责人：
SAWADA Yoshihiro
金额：
$ 1.86万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560423/
关键词：
Microtremor Earthquake motion Spectrum Earthquake amplification Earthquake response

项目摘要

From the engineering viewpoint, we proposed a simple estimation method of seismic response characteristics of surface layer using the microtremor H/V spectral ratios, and verified its applicability based on the earthquake observation data.1. We performed the analysis of observed microtremor H/V data in detail, and compared this with the earthquake H/V observed at ground surface and the transfer functions between surface and bottom. Consequently, it was confirmed that microtremor H/V approximates to the ratio of horizontal and vertical response characteristics in surface layer.2. As for a simple estimation method of seismic response characteristics in surface layer, we judged that the method using the peak frequency and its amplitude of microtremor H/V was the appropriate, according to the result of various examinations.3. To verify the applicability of a simple estimation method, the theoretical seismic responses based on the borehole data of KiK-net were compared with the estimation results obtained from a simple method, and also, the comparison between the response characteristics based on the observation records at Tono strong motion observation network and the strong motion observation sites in Nobi valley during the 2004 Off Kii Peninsula Earthquake and the simple estimation results were carried out. As a result, the ratios of maximum acceleration amplitude on ground surface were roughly 1.0 in the average and the standard deviations were about 0.4. Therefore, the seismic responses of the ground with from thin to thick layer are predictable in safety side by considering 1.4 times estimation result, and it can be said that the proposed method is useful for estimating the seismic response characteristics in a preliminary stage.

从工程角度来看，我们提出了一种使用微晶状体H/V光谱比的简单估计方法，即表面层的地震响应特征，并根据地震观察数据验证了其适用性。1。我们详细介绍了观察到的微晶状体H/V数据的分析，并将其与在地面上观察到的地震H/V进行了比较，以及表面和底部之间的转移功能。因此，已经证实，微生物H/V近似于表面层中水平和垂直响应特征的比率。2。至于一种简单的估计方法在表面层中的地震反应特征，我们认为使用峰频率及其微生物H/V幅度的方法是适当的，根据各种检查的结果。3。 To verify the applicability of a simple estimation method, the theoretical seismic responses based on the borehole data of KiK-net were compared with the estimation results obtained from a simple method, and also, the comparison between the response characteristics based on the observation records at Tono strong motion observation network and the strong motion observation sites in Nobi valley during the 2004 Off Kii Peninsula Earthquake and the simple estimation results were carried out.结果，地面上最大加速度幅度的比率约为1.0，标准偏差约为0.4。因此，通过考虑估计结果的1.4倍，可以预测地面的地震反应在安全方面可以预测，并且可以说该提出的方法对于在初步阶段估算地震响应特征很有用。