| 講演要旨(和文) | | 岩手県奥州市において,1点3成分微動測定を77個所で実施し,微動のH/Vスペクトルのピークおよびトラフ周期にもとづいて基盤深度の分布を推定した。また,北東から南西にかけた測線上の4ヶ所で微動アレー探査を実施した。分散曲線だけでなく1点微動のH/Vスペクトルが満足するように2次元S波速度構造を推定した。その結果,南西から北東にかけて基盤の深度が浅くなることが明らかとなった。また,南西部にはVs770m/sの厚い層があり、北東部の表層にはVs250m/sの薄い層があることがわかった |
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| | 講演要旨(英文) | | Microtremor observations were carried out by using one tri-axial seismometer at 77 sites in Oshu City, Iwate Prefecture. The depths of the basements were estimated from the peak or trough periods of microtremor H/V. S-wave velocity structures at four sites were estimated by using Rayliegh wave phase velocities estimated from microtremor array observations on the southwest to northeast experimental line, too. The both results show that the estimated basement depths were gradually decreasing from the southwest area to the northeast area. |
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