12:09 PM - 12:12 PM
[HDS25-P05] The Relationship between the Development of Slip Surfaces and Small Scarps on Deep-Seated Catastrophic Landslides
3-min talk in an oral session
Keywords:deep-seated catastrophic landslide, slip surface, minor fault, gravitational slope deformation, small scarp, LiDAR
It is considered that the shear proceeds in the brittle fracture zone of a minor fault, and that the weak layer of the slip surface is formed in the creeping rock mass. Also, several meters of the small scarp were formed before the catastrophic landslide, and are consistent with the outline of the catastrophic landslide. In fact, the shear plane came out of the ground by concatenating minor faults that were located intermittently in the mass rock. In addition, large scale planar structures, such as a thrust or high-angle fault, controlled the outline of the catastrophic landslide. Kawarabi and Nagatono, adjacent to Akadani, also have many similar points that are made up of the same geomorphological and geological structures.