| 講演要旨(和文) | | 地盤の凍結による地盤物性値の変化によって，表層地盤の構造探査結果に影響を及ぼす事が考えられる．本研究では，地盤凍結深度の深い釧路で，地中温度の連続計測を実施し，地中温度の季節変化を観測して凍結深度を把握する．平行して，微動アレイ探査と表面波探査をそれぞれ冬期間と夏期間に実施し，S波速度構造モデルの推定を行い，それにより，S波速度構造探査結果の季節変化を評価する．本研究では，表層のS波速度が2月では8月と比較して60m/s大きく推定された．このことから，凍結時にS波速度構造探査を行うと，表層が比較的硬質な地盤と誤って推定される可能性がある |
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| | 講演要旨(英文) | | We think that surface underground structure investigation result is affected by changing physical properties of frozen ground. In Kushiro where frost heaving is deep, we carried out continuous measurement of underground temperature to check the depth of frost heaving. In the winter and in the summer, we also conducted microtremor array observations and surface wave investigation to estimate S-wave structures. Thus, we evaluated seasonal variation of underground structure investigation results in a cold region. The estimated surface S-wave structure was difference in the summer and in the winter. We must estimate carefully surface underground structure in seasonal frozen ground area. |
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