Journal of Geography (Chigaku Zasshi)
Online ISSN : 1884-0884
Print ISSN : 0022-135X
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Relationship between Liquefaction Damage and Landform Classification in Preparing Liquefaction Risk Assessments: Cases in Middle and Lower Reaches of the Tone River and the Tokyo Bay Area
Mamoru KOARAITakayuki NAKANOHiroshi UNE
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2018 Volume 127 Issue 3 Pages 409-422

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Abstract

 Many instances of liquefaction occurred throughout the lowlands of the Kanto Plain, central Japan following the 2011 off the Pacific coast of Tohoku Earthquake. In particular, serious liquefaction damage was concentrated at reclaimed land, such as at former river channels and lakes. This indicates the importance of referring to landform classification when making a liquefaction risk assessment. And, predictions of liquefaction risk should be based mainly on landform classification data. Liquefaction damage varies widely with differences in shallow geological conditions, even within the same landform classification. Liquefaction risk is assessed based on a finer micro landform classification created by adding forms calculated from DEM or by adding boring database sets. In addition, artificial modifications occurring within a short period, such as backfilling a site where gravel was removed, often affect liquefaction phenomena, and it is important to refer frequently to the history of an area.

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© 2018 Tokyo Geographical Society
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