5:15 PM - 6:45 PM
[U15-P99] Slope disasters caused by 2024 Noto Peninsula Earthquake in the Machino District in Wajima City, central Japan
Keywords:2024 Noto Peninsula Earthquake, landslide, deep-seated landslide, gravitational deformation
The Noto Peninsula Earthquake that occurred on January 1, 2024 caused numerous landslides in the mountains of the Machino district, located east of Wajima City. The author studied on the characteristics of slope disasters occurred in the study area due to this earthquake by comparing elevation data before and after the earthquake. The mass movements were strongly influenced by the geology of this region. Many of the landslides occurred on slopes of weathered Neogene sedimentary rocks. Large-scale landslides occurred on the dip slopes of the Neogene sedimentary rocks. Additionally, many gravitational deformations on the order of meters without evident landslides topography were recognized. Many of these slope deformations were accompanied by the occurrence of small-scale patches of bare grounds and destroyed forests. Since these deformed slopes are estimated to have a relatively high vulnerability of landslide to heavy rain after the earthquake, monitoring of the deformation process will be necessary from the perspective of regional disaster prevention.