On the H/V Spectrum

Abstract eng:
The H/V spectral ratio is overviewed from its origin and on the application for practical disaster prevention. First of all 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 on the maximum value and waveform. First, horizontal to vertical ratio was derived from each maximum value and was compared with the softness of ground and the amplification factor. As a result, horizontal to vertical ratio of maximum value highly corresponds to these ground characteristics. On the next step, the H/V spectral ratio of microtremor measured at anywhere was confirmed that it is able to estimate the predominant frequency and the amplification factor for any researchers, and the result of estimation is stable for the measured time and season. The H/V spectral ratio shows the amplification characteristics by the multiple reflections of the SH wave at least around F0, the predominant frequency of sedimentary layer, and shows the characteristics confused by the Rayleigh wave around 2F0. In case of less effect of the Rayleigh wave it is possible to estimate not only preliminary peak but also secondary peak of amplification characteristics caused by multiple reflections with the H/V spectral ratio.

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