| 講演要旨(和文) | | 富士川河口断層帯周辺地域において臨時強震観測を実施し、強震記録を取得した。既存の強震観測点での強震記録と合わせて、周波数0.5から20Hzの帯域でのＳ波のスペクトル分離解析を実施した．震源特性や伝播経路Ｑ値は、先行研究の結果と大きな矛盾はなかった．地盤特性は、富士川河口周辺では、１Hz程度の周波数での増幅率が大きいことや10Hz程度の周波数での増幅率には山地と河口部で大きな差異がないことなどがわかった。 |
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| | 講演要旨(英文) | | We have conducted an analysis of earthquake ground motion records observed around Fujikawa fault zone in central Japan for a reliable strong motion prediction for future earthquakes. Earthquake records at existing strong motion stations and temporary stations around the fault were used to estimate site amplification factors of S-waves with the spectral separation technique. The amplification factors were estimated at frequencies from 0.5 to 20 Hz. The Q-values for the propagation path are similar to those in previous studies. The source spectra at most of the events are approximated by the omega-square model. Distributions of the site amplification factors at several frequency bands are estimated from the results. We found that the site amplifications are large at the estuary area of the Fujikawa river than the mountain areas at frequencies around 1Hz. However, the amplification factors are similar around 10Hz in the two areas. |
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