Drilling survey of dammed sediments of the Ikeyama and Inokubo Landslides, in the Shikoku Island, southwest Japan

Takeyuki Ueki

Presentation information

[E] Poster

H (Human Geosciences ) » H-DS Disaster geosciences

[H-DS07] Landslides and related phenomena

Fri. May 30, 2025 5:15 PM - 7:15 PM Poster Hall (Exhibition Hall 7&8, 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)

5:15 PM - 7:15 PM

[HDS07-P03] Drilling survey of dammed sediments of the Ikeyama and Inokubo Landslides, in the Shikoku Island, southwest Japan

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

Keywords:deep-seated landslide,, occurrence timing,, dammed deposits, drilling survey, southwest Japan, Pleistocene and Holocene

The Ikeyama Landslide located in sedimentary rocks of the Shimanto Accretionary Complex occurred in the Edo Age, deduced from old documents. Our drilling survey revealed that dammed sediments was composed of alternation of gravelly and finer layers, totally more than 23 m in thickness, and radiocarbon ages of Edo Age. The Inokubo Landslide located in shallow-marine sedimentary rocks of the Izumi Belt occurred in the Late Pleistocene, deduced from surface dissection. Our drilling survey revealed that dammed sediments was composed of gravelly layers, 9 m in thickness, and radiocarbon ages of the Late Pleistocene. Drilling survey of dammed sediments is useful to detect the age of old landslide.