5:15 PM - 6:45 PM
[U15-P70] Estimation of the tsunami sources for the earthquake in Noto peninsula on January 1,2024 and Consideration using monitoring data at Power plant
Keywords:Marine active fault, Source model, Reproducing the records
At approximately 16:10 on January 1 2024, an earthquake with a magnitude of Mj7.6 occurred in the Noto region of Ishikawa Prefecture, with an epicenter at a depth of 15km. The earthquake triggered a tsunami that affected coastal areas, particularly along the Noto Peninsula, as confirmed by multiple tide station records. The earthquake caused tremors with a seismic intensity of 6 or higher and resulted in extensive flooding and damage in the coastal area of Suzu City.
The Geospatial Information Authority of Japan released a seismic source fault model for this earthquake based on crustal deformation data from GEONET, while the U.S. Geological Survey proposed a model based on GNSS and InSAR analyses. These models indicated a fault length of 150km or longer, with some parts extending onto land, but they did not align with previously identified marine active fault traces. However, in a follow-up report published on January 15, 2024, the Headquarters for Earthquake Research Promotion suggested a high probability of multiple northeast-southwest striking reverse faults being associated with this earthquake. Therefore, it is difficult to definitively determine the fault source model for this earthquake, and further investigation into the seismic fault source and tsunami source is necessary.
In this study, we conducted a two-dimensional analysis of tsunamis based on non-linear long wave theory using multiple tsunami sources including the Geospatial Information Authority of Japan. We compared the simulation results with tide records from coastal stations operated by the administrative agency.
Additionally, we examined the arrival time and tsunami height using data from wave meters installed in the sea area in front of the Shika nuclear power plant, operated by Hokuriku Electric Company. This study presents the characteristics of tsunamis caused by marine active faults and the estimation of the tsunami source, based on the findings of this examination. Additionally, the confirmation results related to the reproduction of the observed records are also presented.
The Geospatial Information Authority of Japan released a seismic source fault model for this earthquake based on crustal deformation data from GEONET, while the U.S. Geological Survey proposed a model based on GNSS and InSAR analyses. These models indicated a fault length of 150km or longer, with some parts extending onto land, but they did not align with previously identified marine active fault traces. However, in a follow-up report published on January 15, 2024, the Headquarters for Earthquake Research Promotion suggested a high probability of multiple northeast-southwest striking reverse faults being associated with this earthquake. Therefore, it is difficult to definitively determine the fault source model for this earthquake, and further investigation into the seismic fault source and tsunami source is necessary.
In this study, we conducted a two-dimensional analysis of tsunamis based on non-linear long wave theory using multiple tsunami sources including the Geospatial Information Authority of Japan. We compared the simulation results with tide records from coastal stations operated by the administrative agency.
Additionally, we examined the arrival time and tsunami height using data from wave meters installed in the sea area in front of the Shika nuclear power plant, operated by Hokuriku Electric Company. This study presents the characteristics of tsunamis caused by marine active faults and the estimation of the tsunami source, based on the findings of this examination. Additionally, the confirmation results related to the reproduction of the observed records are also presented.