Development of gravitational slope deformation as precursor of deep-seated landslide

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400487
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Geology
• Research Institution: Gifu University
• Principal Investigator: KOJIMA Satoru 岐阜大学, 工学部, 教授 (20170243)
• Co-Investigator(Renkei-kenkyūsha): KANEDA Heitaro 千葉大学, 理学研究科, 准教授 (30415658) ; NAKAMURA Toshio 名古屋大学, 年代測定総合研究センター, 教授 (10135387) ; OHTANI Tomoyuki 岐阜大学, 工学部, 教授 (20356645) ; KATSUTA Nagayoshi 岐阜大学, 教育学部, 准教授 (70377985)
• Research Collaborator: NAGATA Hidehisa (有)風水土, 代表取締役
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 地すべり / 山体重力変形地形 / 北アルプス / 越美山系 / 紀伊半島

Outline of Final Research Achievements

Double ridges and uphill-facing scarps are the results of deep-seated gravitational slope deformation (DGSD), and are considered to be precursors of deep-seated landslides. Geological and geomorphological surveys in Northern Alps, Mino Mountains and Kii Peninsula were performed in order to clarify the developments of these landforms. As the results of surveys some of the DGSDs are stable during the last 100 thousand years and most of the DGSDs were formed in the warm and wet climate conditions just after the last glacial maximum. These lines of evidence indicate not all the DGSDs are the precursors of deep-seated landslides. Moreover the sediments accumulated in the linear depressions between the double ridges, one of the representative DGSDs, have recorded several kinds of signals of environmental changes.

Free Research Field

地質学