Oya collapse - Oya collapse

Japanese: 大谷崩れ - おおやくずれ
Oya collapse - Oya collapse

…In relation to the existence of these two tectonic lines, there are many old and new landslides and collapsed landforms in the mountainous area around the Abe River basin. A typical example is the Otani collapse at the source of the Abe Otani River, which is considered one of the three major collapses in Japan and is estimated to have occurred between the 16th and 18th centuries. The large amount of soil that collapsed at that time became a debris flow, filling the valley of the Abe Otani River and the main Abe River, reaching as far as Magosajima Island, 7 km downstream. …

*Some of the terminology that refers to the "Otani Collapse" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…これら両構造線の存在とも関係して,安倍川流域一帯の山地には新旧数多くの地すべり・崩壊地形が存在する。日本三大崩れの一つともされる安倍大谷川源流の大谷崩れがその代表的な例で,その崩壊は16~18世紀ころに発生したものと推定されている。この際に崩壊した多量の土砂は土石流となって安倍大谷川および安倍川本流の谷を埋積して7km下流の孫佐島付近にまで達した。…

※「大谷崩れ」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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