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Periodicity of large-scale landslide revealed by the landslide-lake sediments and ancient documents

滑坡-湖泊沉积物和古代文献揭示了大规模滑坡的周期性

基本信息

批准号：
13640458
负责人：
KAWAKAMI Shin-ichi
金额：
$ 1.92万
依托单位：
Gifu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13640458/
关键词：
landslide large-scale slope faulure landslide-lake periodicity ancient document accretionary complex Mino terrane

项目摘要

Prediction of large-scale landslides with more than one million cubic meters of landslide debris is important in central Japan with steep-slope topography, because they cause heavy damages on infrastrucutes. Three largest landslides (Nan'notani, Neoshiratani and Tokuyamashiratani landslides) are know to occur during last one hundred years in the Mino terrane. Two of them occurred at the sites with specific geologic structures : the resistant limestones against weathering and erosion are thrust over the weak melanges. These geologic structures formed at the time of accretion, and are useful to predict the future slides in the Mino terrane. Similar geologic structures are present in the Funafuseyama, Ibukiyama, Ryozensan and Fujiwaradake areas. Very large-scale landslides in the western slope of Ibukiyama dammed-up the Anegawa River flowing on the foot of the mountain, and formed landslide lakes. We measured the 14C ages of the lake sediments and revealed the ages of the lakes to be 34,000 and 5,200 years before present. The Sekigahara pass south of Ibukiyama has been the most important traffic route connecting eastern and western Japan, and many ancient documents described landslide events at Ibukiyama. We analyzed these documents and found that the landslide events occured at about 890, 1500, 1700 and 1909 (Anegawa earthquake) AD. These events made no landslide lakes, and the events 34,000 and 5,200 years before present making the landslide lakes were quite large in scale

在日本中部的陡坡地形中，预测超过100万立方米的大型滑坡是非常重要的，因为它们会对基础设施造成严重破坏。在过去的一百年里，美浓江发生了三次最大的滑坡（Nan'notani，Neoshiratani和Tokuyamashiratani滑坡）。其中两个发生在具有特定地质结构的地点：抵抗风化和侵蚀的石灰岩被推覆在软弱的混杂岩上。这些地质结构形成于加积期，对预测米诺河未来的滑坡是有用的。类似的地质结构存在于船濑山、Ibukiyama、Ryozensan和Fujiwaradake地区。伊吹山西坡发生了大规模的山体滑坡，阻塞了山脚下流过的阿尼瓦河，形成了滑坡湖。我们测量了湖泊沉积物的14 C年龄，揭示了湖泊的年龄分别为距今34，000年和5，200年。伊吹山以南的关原山口是连接日本东部和西部的最重要的交通路线，许多古代文献都描述了伊吹山的山体滑坡事件。通过对这些文献资料的分析，发现滑坡事件分别发生在公元890年、1500年、1700年和1909年（阿那瓦地震）。这些事件都没有形成滑坡湖，而距今34,000年和5,200年前的滑坡湖事件规模较大