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Geoenvironmental Disasters

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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