大垣市周辺の常時微動特性について

概要

論文の詳細を見る
The sampling time of the FFT analysis of the seismic wave is usually five second. But it seems better to prolong the sampling time of the microtremor. The sampling time depends on the FFT analyzing time and the noiseless condition. Compared with several running spectra of FFT, the suitable sampling time is twenty seconds. When the noise level is about one and half times higher than the microtremor level, the vibration wave is not worth analyzing by the FFT. In the unhomogenuous soil layer, superior frequencies at the measurement points set at one hundred meters intervals don't show continuous variations. Therefore, when the measurement point interval is ten meters, superior frequencies and spectra figures show continuous variations. As a result, according to the spectra figures in this measurement, it is cocluded that the characteristics of the ground are classified into the three groups around Ogaki city.
岐阜工業高等専門学校の論文
1986-03-20