Japan Geoscience Union Meeting 2025

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[E] Oral

H (Human Geosciences ) » H-DS Disaster geosciences

[H-DS07] Landslides and related phenomena

Fri. May 30, 2025 9:00 AM - 10:30 AM 102 (International Conference Hall, Makuhari Messe)

convener:Gonghui Wang(Disaster Prevention Research Institute, Kyoto University), Hitoshi SAITO(Graduate School of Environmental Studies, Nagoya University), Masahiro Chigira(Fukada Geological Institute), Fumitoshi Imaizumi(Faculty of Agriculture, Shizuoka University), Chairperson:Shintaro Yamasaki(Disaster Prevention Research Institute, Kyoto University), Kongming Yan(Kyoto University)

10:00 AM - 10:15 AM

[HDS07-05] History of the Kanagi Landslide, Kochi Prefecture, southwest Japan

*Takeyuki Ueki1 (1.Faculty of Education an Human Sciences, Teikyo University of Science)

Keywords:deep-seated landslide, occurrence interval, incised-valley-fill deposits, drilling survey, southwest Japan, ,Late Pleistocene

The large deep-seated Kanagi Landslide in the Kochi Prefecture, southwest Japan occurred in the Edo Age, deduced from old documents. However, our drilling surveys of dammed sediments revealed that the landslide occurred primary in Late Pleistocene. An incised-valley-fill deposits downstream of the landslide was composed of wave-cut bench and flood plain deposits, in ascending sequence. No landslide-related facies and radiocarbon ages in such deposits suggested that the landslides occurred twice in Late Pleistocene and Edo Age and interval is during more than ten thousands years.