2007 Volume 43 Issue 6 Pages 339-350
Both the typological classification and the correlation of landslides observed in the area of Shimajiri-mudstone, Okinawa Island is researched. The landslides are classified into the first activated mudstone slides, the quasi-first activated mudstone slides and the re-activated colluvial-soil slides, and also among them have similar systems. The quasi-first activated mudstone slides have existing slide blocks within the lower part of these slide mass, and have the possibility of progressive failure of mudstone which is promoted through the release of stress equivalent to sliding mass. On the other hand, landslides which do not have those the existing slide blocks, are created by the release of insitu stress which is brought with human-induced land alteration.