短周期微動の水平上下スペクトル比による地盤増幅特性評価の可能性に関する研究

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This paper investigates the fundamental characteristics of ratio between horizontal and vertical spectra(H/V-R) of short-period microtremors and elucidates its relationship with ground amplification. In addition, the paper investigates the possibility to predict earthquake ground motion using spectral ratio. The results are summarized as follows: 1) Clearly observed peaks in H/V-R fairly correspond to the 1st mode of ground amplification due to S-wave propagating above bedrock which is a relatively strong reflection boundary. 2) H/V-R can be simulated in 2-dimensions by FEM considering surface waves generated by ground noise. From the numerical simulation of single layer model, it is considered that the abovementioned relationship is valid in the range of impedance ratio exceeding 2-3. 3) H/V-R can be efficiently used to estimate the relative strength of earthquake motion in case of minor changes in ground conditions.
1995-05-30