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The bands of liquefaction emerged by the 2016 Kumamoto Earthquake
Ist Teil von
The Quaternary Research (Daiyonki-Kenkyu), 2019/04/01, Vol.58(2), pp.101-108
Ort / Verlag
Japan Association for Quaternary Research
Erscheinungsjahr
2019
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Damage due to liquefaction in Kumamoto plain has occurred by the 2016 Kumamoto earthquake in Japan. Topographically, liquefaction occurred in former stream channels, floodplains, reclaimed land, natural levees, and so on. Especially, areas of liquefaction in a natural levee is characterized as a 50-100-m wide and ～5-km-long band, spanning from the Shirakawa River to the Kasegawa River. Other two similar bands of liquefaction have been recognized around the Shirakawa River. The band of liquefaction seems to be a former stream channel, but aerial photographs and the historical record do not support that hypothesis. In general, the natural levee, which is relatively short, has a very high liquefaction potential similar to a former stream channel. However, it should be noted that liquefaction did not occurred in the whole of the natural levee, but did occur in the characteristic bands. In addition to the characteristics of topography, the others are that liquefaction area expanded from “foreshock” to “main shock” of the earthquake from comparing with aerial photographs after each shock. The liquefaction damage has been enormously increased due to the influence of characteristic volcanic ash sand.