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本文作者查阅了日本过去地震液化的有关文献资料,论述了液化的真实现象与地基条件的相互关系并对有关液化的因素作了探讨。至少在上一世纪44次地震中,观察了上百个下层土的液化现象,而这些液化地点都只在冲积层或垦拓土地上。此外在几个地带内发现在不同的地震时还出现多次液化。液化地点的地震烈度按日本气象管理处(JMA)规定都超过5度,其最大加速度为80～250伽尔(1/(1000)g),即重力加速度的1/(1000)。液化地带的范围由震级的大小而定。
The author consulted the related literatures about liquefaction in Japan in the past, discussed the relationship between the real phenomenon of liquefaction and foundation conditions, and discussed the factors related to liquefaction. At least during the 44 earthquakes of the last century, the liquefaction of hundreds of subsoils was observed, all of which were on alluvial or reclaimed land. In addition, it has been found in several areas that multiple liquefactions also occur during different earthquakes. Earthquake intensity in liquefaction sites exceeds 5 degrees according to JMA regulations and their maximum acceleration is 80 to 250 Gall (1 / (1000) g), which is 1 / (1000) of gravitational acceleration. The extent of the liquefied zone depends on the size of the magnitude.