Japan Geoscience Union Meeting 2015

Presentation information


Symbol H (Human Geosciences) » H-DS Disaster geosciences

[H-DS25] Geohazards in humid, tectonically active countries and their precursors

Thu. May 28, 2015 9:00 AM - 10:45 AM 101A (1F)

Convener:*Masahiro Chigira(Disaster Prevention Research Institute, Kyoto University), Satoru Kojima(Department of Civil Engineering, Gifu University), Hiroshi YAGI(Faculty of Art, Science and Education, Yamagata University), Taro Uchida(National Institute for Land and Infrastructure Management), Chair:Hiroshi YAGI(Faculty of Art, Science and Education, Yamagata University), Jiro Komori(Teikyo Heisei University)

9:45 AM - 10:00 AM

[HDS25-04] Preliminary study on formative factor of uphill facing scarplets based on bell-shape index of high relief mountains

*Hiroshi YAGI1, Kazunari HAYASHI2 (1.Fac. Art, Science & Education, Yamagata Univ., 2.Okuyama Boring Co.Ltd.)

Keywords:gravitational deformation, bell-shape index, high relief mountain, strike slip active fault

Double ridges or up-hill facing scarplets distributed on mountain ridge in high relief are known as indicators that mountain bodies are undergoing gravitational creep deformation and as signs of landslide in large scale.
Mountain ridges in northern part of Hida Range (Northern Japan Alps) show gentle and round and are fringed by distinct break of slopes. Mountain profiles of high contrast between steep lower slope and gentle ridge ridge tops are similar to a bell-shaped mountains of high relief. In another word, the bell-shaped profile is one kind of the convexity in ridge profiles. The authors think this index is a good marker of gravitational rock creep and a subsequent deformation of mountains. However, there sometimes develop up-hill facing scarplets on low convexity slope in that area. This study tries to consider contribution of strike slip faults as to the formation of up-hill facing scarps on such slopes.