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The 1995 Hyogo-ken Nanbu earthquake occurred on January 17 1995. The maximum seismic intensity was seven in Kobe city and a part of Awaji island. We observed the aftershocks at three stations in Awaji... island using three strong-motion seismometers and a broad-band seismometer from January 19 to April 4. During this period, we observed 89 events. In these events, nine events were observed at all of the three stations. Among the nine events we analyzed three events using integration of velocity in the time domain and amplitude spectrum of S-wave for 5 seconds. We also analyzed amplitude spectral ratios of two events occurring in Kobe side for 20 seconds from P-wave arrival, for 20 seconds from S-wave arrival, and S-wave part for 5 seconds. From those amplitude spectra, we found predominant frequency around 1- 4 Hz for IWY and ABK stations, but TSM predominant frequency around 4-7 Hz. The spectral ratio shows 3-10 times amplification, around 1-2Hz and 4-7 Hz for TSM/IWY, and around 0.9 -2 Hz and 4-7Hz for ABK/IWY. For TSM/IWY, we saw 2-5 times attenuation around 2-3 Hz. We also report on the detailed condition of observation and some phenomenalistic analyses of the observed events.続きを見る
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