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Monitored transition from sagging to sliding during deep-seated gravitational slope deformation, Akatani-nishi, Japan by Nozomi Yamamoto; Yasuo Ishii; Ryo Hirata; Sakiko Tetsuka; Taku Yamada is a Environmental Science article available to read on EtoBox.

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To clarify the mechanism of deep-seated gravitational slope deformation (DSGSD), we investigated crushed rocks and subsurface deformation in a slope southwest of Akatani landslide, in Gojo city, Japan, on which a deep-seated catastrophic rapid landslide occurred in 2011. We analyzed subsurface deformation from 2017 to 2022 using monthly inclinometer data from three 85-90 m deep cored boreholes. Crushed rocks were investigated based on visual observations of the core. We examined the fractures of rock in the borehole wall based on borehole camera images. The inclinometer measurements within the DSGSD slope indicated that sliding occurred in the upper slope, and sagging occurred in the mid-slope, with two sliding surfaces identified at depths of 47.5 and 54.5 m. At a depth of 47.5 m, the average annual displacement increased by one order of magnitude when the groundwater level rose remarkably due to rainfall. This suggests that the movement of slope transitioned from sagging to sliding under the action of rising groundwater in the mid-slope. There was more crushed rock in the cores from the upper slope, where sliding occurs, than in the cores from the mid-slope, where sagging occurs.

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Author

Nozomi Yamamoto; Yasuo Ishii; Ryo Hirata; Sakiko Tetsuka; Taku Yamada

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)