[U-15] The 2024 Noto Peninsula Earthquake (1:J)

[U15-P84] Earthquake and tsunami traces in seafloor sediment around Noto Peninsula

*Takuya Sagawa¹, Robert Jenkins¹, Yoichi Usui¹, Yoishiro Kitani², Shozo Ogiso², Kosuke Matsubara³, Asuka Yamaguchi⁴, Masafumi MURAYAMA⁵ (1.Institute of Science and Engineering, Kanazawa University, 2.Institute of Nature and Environmental Technology, Kanazawa University, 3.Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 4.Atmosphere and Ocean Research Institute, The University of Tokyo, 5.Faculty of Agriculture and Marine Science, Kochi University)

Keywords:Noto Peninsula earthquake, seafloor sediment, tsunami, submarine landslide

The earthquake occurred on January 1st 2024 (M7.6) and its accompanying tsunami had significant impacts on Noto Peninsula and surrounding regions. The earthquake and tsunami have affected the seafloor around Noto Peninsula, especially the coastal area facing Suzu city. It is also suggested that submarine landslide in coastal area contributed to the occurrence of tsunami immediate after earthquake. Detailed bathymetric mapping is underway to determine the extent of submarine landslide, but the effects of landslide on sediment disturbance and benthic organisms are not well understood.
We collected surface sediments offshore of Suzu city three and seven weeks after the earthquake and piston cores were collected along depth transects further offshore area in March during Hakuho-maru cruise. The sedimentary structure of these sediment cores will be investigated by visual core description and X-ray CT imaging, as well as grain size analysis, element analysis, and benthic organism. In this session, we report preliminary results of sedimentary characteristics of surface sediments.