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Geoenvironmental Disasters

Table 5 Classifications of slope stability and instability based on Ray and De Smedt (2009) and Teixeira et al. (2015)

From: Three-dimensional seismic slope stability assessment with the application of Scoops3D and GIS: a case study in Atsuma, Hokkaido

Stability classification

Factor of safety

Slope stability class

1

Fs ≤ 0.75

very unstable

2

0.75 < Fs ≤ 1

unstable

3

1 < Fs ≤ 1.25

quasi stable

4

1.25 < Fs ≤ 1.5

stable

5

Fs > 1.5

very stable

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