埼玉平野中央部における異常震動と液状化現象

概要

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Liquefaction has been repeatedly caused by the local violent shake in the Saitama plain, central Japan. In this plain, the earthquake is vertical in motion at the so-called abnormalous seismic vibrated zone (Tsunoda, F., 1980). Moreover, we sometimes feel a severe horizontal shock of earthquake in this zone. Such vibration is of frequent common occurrence in the drainage area s of the Ayase and the Motoarakawa in the Saitama plain. In these lowland, the shock was especially severe at the Great earthquake of 1923. It was a similar occurrence on the occasion of the western Saitama earthquake of 1931. Accordingly, outbreak of liquefaction was repeated in the drainage areas mentioned above. However, it was not occurred in other places of the Saitama plain in spite of the same geological and geographical condition. On the basis of these data, liquefaction occur from a local intense shock in the Saitama plain. Its mechanism is shown in Figure 6.
日本地質学会の論文