地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
短報
利根川下流域における液状化被害分布と沖積層の構造との関係
小松原 純子石原 与四郎石原 武志風岡 修水野 清秀
著者情報
ジャーナル フリー

2017 年 126 巻 6 号 p. 715-730

詳細
抄録

 Liquefaction damage, caused by the 2011 off the Pacific coast of Tohoku Earthquake, occurred widely in the downstream basin of the Tone River, Kanto district, central Japan. The extent and distribution of liquefaction damage represented as sediment venting is investigated with classified topography based on aerial photographs and previous studies, and a three-dimensional geological model is constructed using existing boring logs and all-core boring data. The relationships between the distribution of liquefaction damage and topography and geological structures, such as buried valleys and distribution of inner-bay muddy deposits at the Holocene highstand, is discussed. The distribution of liquefaction damage generally traces the shape of reclaimed land, including paleochannels and flood pools, but in some places liquefaction occurred outside reclaimed land. A relatively deep geological structure may affect the disagreement between actual distribution and geographical prospects of liquefaction damage; however, the shapes of buried valleys and inner-bay muddy deposits do not clearly explain the distribution of liquefaction. Geological structures, which are invisible as topographic features or independent of valley fill structures, or multiple factors may have a combined affect.

著者関連情報
© 2017 公益社団法人 東京地学協会
前の記事 次の記事
feedback
Top