On November 16-18, we went to Ontake again for a field survey.
This time, the main purpose was to investigate the stratigraphy of the site, which we will study in detail in the future.
We dug a hole of approximately 4 meters!
Prof. Jiro Kuwano of Saitama University joined us and we were able to confirm the stratigraphy up to the layer that is thought to have caused the slide in the past.
We also conducted in-situ direct shear box tests and vane shear tests on the volcanic ash soil near the surface.
Based on the information obtained from this year’s survey, we will conduct further research next year!