著者

田畑 茂清 水山 高久 井上 公夫 杉山 実

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.53, no.1, pp.59-70, 2000-05-15 (Released:2010-04-30)

参考文献数

48

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Hietu Earthquake of M 7.0-7.1 induced a large landslide so called as Tombi landslide on Mt. Tombi in the up-stream area of the Jouganji River in central Japan, on April 9, 1858. This study examines all the available informationon the Tombi landslide, especially its volume and movement, in order to make the whole aspect as clear as possible.According to old documents, two peaks called as Oh (large)-Tombi and Ko (small)-Tombi collapsed and the land-slide debris dammed up mountain valleys to form two large lakes. The landslide dams then failed on April 23 after 14days, and a mud or debris flow rushed down along the Jouganji valley into the Jouganji fan. A mud or debris flow oc-curred again on June 7 after 59 days. The Tombi landslide scarp is composed of massive andesite lava on granodioritebase, which the uppermost part is fragile, and this geological setting was apparently one of the important causativefactors for the slope failure with the shock of the earthquake. The fades of the landslide debris indicated that a rapiddebris avalanche occurred.The volume of landslide debris was estimated as 1.27×108m3 from the distribution of remaining debris in the valley.The landform of Oh-Tombi and Ko-Tombi before the landslide was supposed referring to old document and drawings.The volume of landslide mass was estimated by comparing the old landform with the present landform. The result ofvolume 1.14×108m3 corresponds well with the estimated volume of depositions.

著者

田畑 茂清

出版者

公益社団法人 砂防学会

雑誌

砂防学会誌 (ISSN:02868385)

巻号頁・発行日

vol.26, no.2, pp.60-64, 1973-11-01 (Released:2010-04-30)

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7月30日夜から31日未明にかけて,福岡県を中心に,寒冷前線の移動に伴う集中豪雨に見舞われ,時間雨量95mmという大きな雨量を記録した。このため,福岡市周辺の太宰府町,篠栗町などで,土石流・中小河川のはんらんによる家屋の倒壊・流失・浸水などの被害が相次ぎ,死者・行方不明26名にのぼる大きな災害となった。そこで福岡県は31日に災害対策本部を設置し,特に被害の大きかった太宰府町には,災害救助法を適用することを決めている。この集中豪雨による被害は,警察庁の調べによると表-1のとおりである。