ANALYSIS OF TSUNAMI BEHAVIOR IN JOETSU REGION OF NIIGATA PREFECTURE CAUSED BY 2024 NOTO PENINSULA EARTHQUAKE

Abstract

 In January 2024, an earthquake struck the Noto Peninsula, causing a tsunami that reached the coastal regions of Niigata Prefecture. In Joetsu City, the tsunamis breached seawalls and flooded coastal parks and beaches, leading to damages such as the destruction of beachfront properties. In this study, with the aim of comprehensively understanding the tsunami's impact, we conducted field surveys and numerical tsunami propagation experiments. Field surveys spanned Joetsu City, extending westward towards Itoigawa City and northeastward towards Kashiwazaki City. During the surveys, tsunami inundation heights were measured using laser rangefinders and RTK-GNSS. Additionally, aerial photography via unmanned aerial vehicles provided terrain data, aiding in pre- and post-tsunami topographical assessments and inundation height evaluations. In numerical experiments, fault displacement was computed to simulate water level changes caused by the tsunami using a two-dimensional plane model. This facilitated the estimation of tsunami arrival times at various locations. Subsequently, the obtained results were compared with observational data for validation.