11:30 AM - 11:45 AM
[HDS09-09] The distribution of Tsunami inundation and runup height in the northern Noto Peninsula associated with the 2024 Noto Peninsula earthquake
Keywords:2024 Noto Peninsula earthquake, Tsunami, runup height, GIS
1. Introduction
The 2024 Noto Peninsula earthquake occurred on January 1, 2024. Following this earthquake, a tsunami was observed over a wide area along the coast of the Sea of Japan.
Various agencies have investigated the distribution and runup height of tsunamis caused by this earthquake. However, it is difficult to understand the overall characteristics of the tsunami due to the limited number of surveyed sites. Therefore, we developed a tsunami inundation area map based on the interpretation of aerial photographs. In this study, we report the distribution and characteristics of tsunami inundation and runup height in the northern Noto Peninsula, where significant tsunami inundation damage was observed, based on the interpretation of high-resolution aerial photographs and field survey.
2. Materials and methods
In order to reveal the distribution of tsunami inundation areas, we used high-resolution aerial photographs taken by the Geospatial Information Authority of Japan (GSI). We interpreted about 370 km of coastline and mapped the tsunami inundation area as GIS data. Based on the mapped data and DEM, we estimated the distribution of tsunami runup heights.
3. Distribution of tsunami inundation area
Tsunami inundation was observed on the eastern and western sides of the Noto Peninsula and Hegurajima Island. The area of tsunami inundation was about 1.9 km2. The tsunami inundation was observed from Shoinmachi, Suzu City to Shiromaru, Noto Town, and Hegurajima Island, Wajima City in Ishikawa Prefecture, where houses were washed away or damaged in lowlands at an elevation of 2 to 3 m. Furthermore, minor tsunami inundation was observed from Shinbo, Noto Town to Kabuto, Anamizu Town, and Shika Town. On the other hand, few tsunami inundations were distributed along the northern and northwestern coasts of the Noto Peninsula. Since there is a complementary relationship between the distribution of the tsunami inundation area and the distribution of the uplifted shore platform associated with the 2024 earthquake, the distribution of tsunami inundation may be affected by the difference in the amount of coseismic uplift.
4. Distribution of tsunami runup height
The tsunami runup height exceeded 4m on the northeast coast of Noto Peninsula. Also, the tsunami runup height may have been less than 5m at Hegurajima Island, Wajima City. This study is ongoing, and the results will be discussed based on the interpretation of high-resolution aerial photographs and field surveys at the presentation.
The 2024 Noto Peninsula earthquake occurred on January 1, 2024. Following this earthquake, a tsunami was observed over a wide area along the coast of the Sea of Japan.
Various agencies have investigated the distribution and runup height of tsunamis caused by this earthquake. However, it is difficult to understand the overall characteristics of the tsunami due to the limited number of surveyed sites. Therefore, we developed a tsunami inundation area map based on the interpretation of aerial photographs. In this study, we report the distribution and characteristics of tsunami inundation and runup height in the northern Noto Peninsula, where significant tsunami inundation damage was observed, based on the interpretation of high-resolution aerial photographs and field survey.
2. Materials and methods
In order to reveal the distribution of tsunami inundation areas, we used high-resolution aerial photographs taken by the Geospatial Information Authority of Japan (GSI). We interpreted about 370 km of coastline and mapped the tsunami inundation area as GIS data. Based on the mapped data and DEM, we estimated the distribution of tsunami runup heights.
3. Distribution of tsunami inundation area
Tsunami inundation was observed on the eastern and western sides of the Noto Peninsula and Hegurajima Island. The area of tsunami inundation was about 1.9 km2. The tsunami inundation was observed from Shoinmachi, Suzu City to Shiromaru, Noto Town, and Hegurajima Island, Wajima City in Ishikawa Prefecture, where houses were washed away or damaged in lowlands at an elevation of 2 to 3 m. Furthermore, minor tsunami inundation was observed from Shinbo, Noto Town to Kabuto, Anamizu Town, and Shika Town. On the other hand, few tsunami inundations were distributed along the northern and northwestern coasts of the Noto Peninsula. Since there is a complementary relationship between the distribution of the tsunami inundation area and the distribution of the uplifted shore platform associated with the 2024 earthquake, the distribution of tsunami inundation may be affected by the difference in the amount of coseismic uplift.
4. Distribution of tsunami runup height
The tsunami runup height exceeded 4m on the northeast coast of Noto Peninsula. Also, the tsunami runup height may have been less than 5m at Hegurajima Island, Wajima City. This study is ongoing, and the results will be discussed based on the interpretation of high-resolution aerial photographs and field surveys at the presentation.