| 講演要旨(和文) | | 富山県高岡市の五位ダム湖岸で発生した麻生谷地すべりにおいて、高精度二次元表面波探査を行い、同じデータセットを使って屈折法の解析も行った。その結果、Vs断面図では崩積土と考えられる低速度部を把握できた。Vp断面図では、1.5km/s層上面が地表面と不調和な分布を示し、地下水面を示すと推定された。これらの解析結果は、後で掘られたボーリング結果と調和し、発生直後の地すべり調査における両手法の有効性を示すことができた。 |
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| | 講演要旨(英文) | | The landslide occurred in the lake shore of the Goi dam in Toyama Prefecture in April, 2006. In this landslide, we conducted the two-dimensional surface wave survey and we analyzed the same data set using seismic refraction method. As a result of the surface wave survey, the distribution of the low speed part thought to be a colluvial deposit was able to be understood. In the Vp cross section, the upper surface of 1.5km/s layer was presumed to be equivalent to the groundwater. These results harmonized with the result of the borehole dug up later, and we were able to show the effectiveness of both methods in the landslide investigation immediately after disaster generation. |
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