We went to Otaki Village, Nagano Prefecture, to conduct field survey.

In Otaki Village, a large-scale slope failure and debris flow known as the ‘Ontake Kuzure (御嶽崩れ)’ occurred during the 1986 Naganoken-seibu Earthquake.
The volume of collapsed sediment is around 34 million cubic meters!

The weather was clear, and thanks to the guidance of Takewaki-san, an Ontake Volcano Meister, we were able to observe the collapsed area.
Some members got very close to the collapse site.

We were simply overwhelmed by its tremendous scale.

「Ontake Field Suevey」への1件の返信


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