[HDS08-P16] Simulations of sediment movement for tsunami deposits in Kamoda Pond along the Nankai Trough
Keywords:Nankai Trough Earthquake, Sediment Transport software, Tsunami deposits
The submarine active fault is the Kitan-Naruto strait section of the Median Tectonic Line fault zone, and the splay fault branches from the plate interface near Cape Muroto (Okamura, 1990). We examined whether each fault brings tsunami sediments in Kamoda Pond using STM. Also, from a tsunami database constructed by performing a large-scale tsunami calculation using 3967 earthquake scenarios of Hirata et al. (2017) and high-precision terrain data in the Nankai Trough. Scenarios that bring tsunami to Kamoda Point were searched from the tsunami database.
As a result of the investigation, Kamoda Pond was inundated in the case of considering the splay fault and in 13 scenarios of the tsunami database, in which a large slip area and a very large slip area were located in the area between the Kii Peninsula and Cape Muroto. The Cabinet Office's source model considered as "the largest class earthquake considering all possibilities" may not be the largest in some coast along the Nankai trough. However, we need more investigations to make sure that the Cabinet Office's source models do not inundate to Kamoda Pond by varying calculation conditions such as topography and tide level.
Acknowledgments: In this study, we used the sediment transport model developed by Takahashi et al. (1999, 2000, 2011). This work was supported by JSPS KAKENHI Grant Number 19H02409.