Introduction to the Special Issue of the Symposium on deep-seated landslides and large-scale rock avalanches     

Norio Oyagi  Marino Sorriso-Valvo  Barry Voight 《Engineering Geology》1994,38(3-4):187-188

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Structural and fabric analyses of basal slip zone of the Jin’nosuke-dani landslide, northern central Japan: its application to the slip mechanism of decollement     

Kiichiro Kawamura  Yujiro Ogawa  Norio Oyagi  Tetsuro Kitahara  Ryo Anma 《Landslides》2007,4(4):371-380

We describe in detail the deformation structures and textures of a large-scale landslide body that developed in the Betto-dani Valley in northern central Japan. We studied the shape-preferred orientation of clasts and clay flakes and the development of internal shear planes within the slip zone of the landslide. The slip has an average rate of 5–10 cm/year under the overburden pressure of approximately 1.6 MPa; these values are similar to those of the proto-decollement zone of the Nankai accretionary prism in SW Japan. The anisotropy of magnetic susceptibility of samples obtained from the slip zone reveals that the long axes of clay flakes define an imbricate structure. The slip was due to a long-term periodical creep, which occurs during the thaw seasons with an average slip rate of 0.16–0.32 μm/min. During the creep, the long axes of grains including clay flakes in the slip zone are developed from parallel to perpendicular to the slip direction. The observed textures provide a clue to elucidate the deformation textures and process in the decollement zone of the Nankai prism.  相似文献   

Active basal slip zones in the Jin'nosuke-dani landslide, Mount Hakusan, Central Japan     

Kiichiro  Kawamura  Yujiro  Ogawa  Tetsuro  Kitahara  Ryota  Endo  Ryo  Anma  Norio  Oyagi 《Island Arc》2008,17(2):183-184

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