微動から推定された地盤特性のうち何が利用できるか

概要

論文の詳細を見る
We previously presented conclusions about the possibility of using microtremor measurements to estimate site-specific seismic response characteristics, which we had drawn from the comparison of seismic motions and microtremors obtained in Kushiro. In this paper we examine whether those conclusions are applicable under different microtremor and geological conditions. Taking the conclusions from Kushiro into consideration, we drew the following comprehensive conclusions about the use of microtremors: (1) a sharp-peak frequency of the horizontal-to-vertical spectral ratios (HV) is identified with the predominant frequency of sediments with a high possibility, while a sharp-peak frequency of power spectra is not always identified with it. (2) the spectral ratios of horizontal components between different sites (HH) can be used to estimate the spatial variation of horizontal seismic motion in small areas with a diameter of a few hundreds meters. (3) the spectral ratios HV slightly overestimate vertical seismic motions.
1998-07-30