The soil is classified to tidal sandy soil, derived from river alluvium with sandy loam texture. 土壤分类为河流冲积土发育的潮汐沙土，砂壤土质地。
Yet the soft alluvial sediment of Tokyo's low-lying areas, it is now understood, is vulnerable to liquefaction, in which violent movement turns the soil to quicksand. 人们现在意识到了，东京的一些地势低的地方，松软的冲积土很容易受到液化作用的影响，强烈的运动会使土壤成为流沙。
