Study on applicability and its limit of microtremor H/V method

在这项研究中，我们利用近年来在日本建立的Kik-Net、K-Net和Nobi Plain强震运动观测台网的地震观测资料，检验了微震H/V方法的适用性。对基岩S波速大于1500m/S的221个场地的地表微震进行了观测，并与地震资料进行了比较。作为检验结果，澄清了以下几点。微震H/V谱比不仅与地面地震记录的H/V谱非常相似，而且与地表与基岩之间的几种地震动谱比也非常相似。这意味着微动H/V反映了表层水平运动和垂直运动的响应特征。在此基础上，尝试提出了一种利用地震动H/V与地震观测数据之间的关系来推算地表水平入射波响应特征的工程方法。

In this research, we examined the applicability of microtremor H/V method by earthquake observation data recorded at the strong earthquake motion observation networks of KiK-net, K-net and Nobi Plain which have been established in Japan in recent years. We observed the microtremors at ground surface of total 221 sites where the S wave velocity of base rock is more than 1500m/s, and compared the microtremor H/V spectrum ratio with that of earthquake data. As the result of examination, the followings were clarified. A clear predominant peak appears at a high rate in microtremor H/V. The microtremor H/V spectrum ratio is very similar not only to that of earthquake record on the ground surface, but also to several spectrum ratios of earthquake motions between surface and bedrock. This implies the microtremor H/V reflects the response characteristics based on the both of horizontal and vertical motions in the surface layer. Then, we tried to propose an engineering method in presuming the horizontal incident wave response characteristics of surface layer by using the relation between microtremor H/V and earthquake observation data.