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Table 1 Activity values in soil materials (Skempton 1953)

From: Characteristics of tuff breccia-andesite in diverse mechanisms of landslides in Oita Prefecture, Kyushu, Japan

Classes of activity Activity value
Inactive < 0.5
Inactive 0.5–0.75
Normal 0.75–1.25
Active 1.25–2
Active > 2
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