Japan Geoscience Union Meeting 2019

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[J] Poster

S (Solid Earth Sciences ) » S-SS Seismology

[S-SS15] Active faults and paleoseismology

Tue. May 28, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Takashi OGAMI(National Institute of Advanced Industrial Science and Technology), Ryosuke Doke(Hot Springs Research Institute of Kanagawa Prefecture), Hisao Kondo(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

[SSS15-P01] Paleoseismicity of Atsuma Town , Hokkaido: Evidence from landslide deposits

*Jun Tajika1, Tetsuya Inui2 (1.Docon Co.,Ltd., 2.Board of Education, Atsuma Town)

Keywords:Paleo seismology, Liquefaction, landslide body

Many landslides occurred by the 2018 Hokkaido Eastern Iburi Earthquake in Atsuma-cho. We reported about discovering of ancient landslide deposit from an archeological site of the Jomon period in Atsuma in 2004 and 2016. It was inferred that this landslide was caused by an earthquake and it probably occurred at activity event of the Ishikari teichi-toen active fault zone. The morphological characteristic of the landslide deposit resembles that of landslide caused by this earthquake. The archeological findings of the past remains excavation in Atsuma-cho area shows that the event of a lot of landslides caused by earth quake is only 2018 Hokkaido Eastern Iburi Earthquake and an earthquake of the Jomon period during last 9,000 years.