[H-DS07] Landslides and related phenomena

[HDS07-P07] On the liquefaction and landsliding phenomenon in Uchinada Town triggered by the 2024 Noto Peninsula Earthquake

*Gonghui Wang¹, Gen Furuya², Koichi Hayashi¹, Issei Doi¹, Makoto Matsuzawa¹, Kongming Yan¹ (1.Disaster Prevention Research Institute, Kyoto University, 2.Toyama Prefectural University)

Keywords:2024 Noto Peninsula Earthquake, Landslide, liquefaction, Shear behavior, Geophysic survey

During the 2024 Noto Peninsula Earthquake, different types of geohazards occurred on the wide area of Kanazawa, Toyama and Niigata Prefecture. Among these geohazards, liquefaction and lateral spreading phenomena occurring on Uchinada area were extremely severe, resulting great damage to local properties, such as landslides with blocking of drainage river channel, lateral moving of ground with houses, titling of main roads, on wide area. To unravel the reasons for these phenomena, we conducted multiple types of geophysical surveys (including MASW, ERT) on the ground of severely damaged areas, conducted cone-penetration tests. We sampled sandy soils from the liquefied sands, and conducted undrained static and dynamic loading tests on the samples. The MASW survey results showed that the soil layers have low Vs value (around???), while ERT survey results indicate that the soil layers have shallow ground water. Results of undrained ring shear tests reveal that the sands could be liquefied subjected to the strong shaking similar as that observed in the main shock. We further analyzed the variation of geohazard potential with local development of soil lands.