[P13] Submarine Landslide Induced Tsunami Modeling Using 3D Slope Stability Analysis Method: The 2024 Noto Peninsula Earthquake and Tsunami in Toyama Bay, Japan
| Affiliation | IRIDeS, Tohoku University |
|---|---|
| Author | Al Farizi Muhammad Daffa |
| Co-Author | Anawat Suppasri（IRIDeS, Tohoku University） Fumihiko Imamura（IRIDeS, Tohoku University） Tsuyoshi Nagasawa（Pacific Consultants co ltd Tokyo） Yukio Mabuchi（Pacific Consultants co Tohoku） Tatsunori Nogami（Pacific Consultants co Tohoku） Saneiki Fujita（Graduate School of Engineering） Shuji Moriguchi（IRIDeS, Tohoku University） |
Keywords
- Submarine Landslide
- Landslide Induced Tsunami
- Hovland’s 3D Slope Stability
- TUNAMI-N2 model
- Toyama Bay
Outline
The tsunami that happened in Toyama Bay after the major earthquake in Noto Peninsula, Japan, on January 1, 2024, serves as a crucial case for understanding the complexities between submarine landslides and tsunami generation. Unlike tsunami induced by earthquake, which has been well studied and understood, the submarine landslide induced tsunami are less frequent and more challenging to comprehend. However, it still caused a significant damage to coastal areas as the impact of this non-seismic tsunami event. Following an earthquake in Noto Peninsula (Mw 7.5), non-seismic tsunami were generated by submarine landslides, highlighting the risks associated with such landslides, as tsunami can occur even without seismic activity. This study aims to model tsunami induced by submarine landslide excluding the earthquake’s contribution to tsunami generation. Hovland’s 3D Slope Stability Analysis for cohesive-frictional soils as the method to modeling the submarine landslide scenarios in Toyama Bay where early arrival of tsunami waveform was observed. This analysis offers insights into the initiation and dynamic of landslide, including its size, location and impact on the surrounding environment. Furthermore, to simulate this result into tsunami model, two-layer computational tsunami modeling, TUNAMI-N2, was utilized. This method solves the non-linear shallow water equation to simulate the propagation of tsunami waves generated by the landslide scenarios. By isolating the landslide as the tsunami source, we focus on the impact of the waves, their propagation across bay area and their impact on the coastal area of Noto Peninsula. The early arrival of the tsunami can be defined as a submarine landslide near Toyama Bay, a location with the findings reported by the Japan Coast Guard in their bathymetric survey results. The findings of this study will contribute to make the understanding of landslide induced tsunami, providing a valuable insight into tsunami behavior, coastal risk assessment, the development of more effective early warning systems and mitigation strategies for coastal areas vulnerable to such as events.
