Abstract
2018年北海道胆振東部地震（M6.7）においてKiK-net追分（IBUH01）で震度7，K-NET追分（HKD127）で震度6強の非常に大きな震度が観測された．両地点で観測された大加速度記録に関して，定圧繰返し一面せん断試験，微視的研究，および弾塑性論に基づく考察を加えた．この結果，両観測地点では表層地盤のダイレイタンシーによる下向き上下動加速度（体積膨張）が発生し，発生した上下動と水平動が強く連成することを示した．
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