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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 classificationFactor of safetySlope stability class
1Fs ≤ 0.75very unstable
20.75 < Fs ≤ 1unstable
31 < Fs ≤ 1.25quasi stable
41.25 < Fs ≤ 1.5stable
5Fs > 1.5very stable