17. 千葉市西北郊登戸の地下水と震害
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概要
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The writers made hydrological investigations of 110 drilled wells in the vicinity of Tiba City on Apr. 28/29, 1935. The region being surveyed by them is diluvial hill which consists of alternative strata of loam and sand. At the bottom of very shallow valley in the neighbourhood of Nobuto. there is a zone of perched water which is sustained on a thin sandy clay stratum between loam (upper) and sand (lower) layers. The depth of underground water table below the ground is only 1―2 m at its central part, while that of surrounding district whose ground water is contained in a thick sand layer is no less than 8 m. The surface of the perched water zone is muddy on rainy days.
- 東京帝国大学地震研究所,Earthquake Research Institute, Tokyo Imperial University,東京文理科大學地理學教室の論文
- 1938-03-20