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Chapter 1.3 Basic Structure of QTS (HVSR) and Examples of Applications

机译：第1.3章QTS（HVSR）的基本结构和应用示例

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The H/V spectral ratio, alias QTs, Quasi Transfer Spectrum, is overviewed from its origin to the application for practical disaster prevention. The H/V spectral ratio was found from the strong motion records at various sites in Japan. On the soft ground, horizontal motion is larger than vertical motion. On the other hand, on the hard ground, both horizontal and vertical motions are similar to each other both onrnthe maximum value and waveform. It is proved in the present paper that the peak of H/V ratio (QTS), either for microtremor of for earthquakes cannot be explained with Rayleigh waves, since Rayleigh wave energy is very small for the peak frequency but high on the trough of H/V ratio. Author's explanation in Nakamura (1989) is correct for explaining this peak with SH waves. The H/V spectral ratio shows the amplification characteristics by the multiple reflections of the SH wave at least around F_0, and shows the characteristics contaminated by the Rayleigh wave around 2F_0.rnBased on this result, the way to estimate the basement depth and the vulnerability indices called K values were introduced. K values are simply derived from strains of ground and structures.rnIt seems to be possible to find the weak points previously with K values because of the high correlation between the earthquake damage and K values. There are research groups to establish the database on the vulnerability of structures. The H/V spectral ratio is already popular on the various research fields. It is happy that K values contribute to increase the earthquake-resistant capacity of the city with dissemination of the technique for investigation of the earthquake-resistant capacity.
机译：从其起源到实际防灾应用概述了H / V频谱比率（别名QTs，准传输频谱）。 H / V频谱比是从日本不同地点的强运动记录中发现的。在柔软的地面上，水平运动大于垂直运动。另一方面，在坚硬的地面上，水平和垂直运动在最大值和波形上都相似。本文证明，无论是地震的微小震颤，H / V比（QTS）的峰值都不能用瑞利波来解释，因为瑞利波能量对于峰值频率来说很小，但在波谷上却很高。 / V比。作者在Nakamura（1989）中所作的解释对于用SH波解释该峰是正确的。 H / V光谱比至少在F_0附近通过SH波的多次反射显示放大特性，并在2F_0附近显示受瑞利波污染的特性.rn基于此结果，估算基底深度和易损性的方法介绍了称为K值的索引。 K值只是从地面和结构的应变中得出的。rn由于地震破坏与K值之间的相关性很高，因此以前可能找到具有K值的薄弱点。有研究小组建立有关结构脆弱性的数据库。 H / V光谱比已在各个研究领域流行。令人高兴的是，K值通过传播调查抗震能力的技术而有助于提高城市的抗震能力。

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