2022 Volume 78 Issue 2 Pages I_265-I_270
A tsunami that struck Sulawesi Island in Indonesia in September 2018 caused enormous damage to the city of Palu. On the other hands, some historical tsunamis, which assumed to be caused by a submarine landslide were observed at tide gauges along Japanese coastal area as well (ex. Suruga Bay Earthquake in 2009). Therefore, the risk of tsunamis from submarine landslides should be appropriately assessed, particularly in Japan, where the seabed is steep and there are many faults.
In this study, we apply a 3-dimentinal slope stability analysis model of submarine landslides to reproduce source of the tsunamis which were assumed to be caused by submarine landslides in 2009 Suruga Bay Earthquake. Risk distribution evaluation for submarine landslides is conducted based on bathymetry, soil condition and seismic intensity. Furthermore, a two-layer tsunami simulation are applied to the tsunami reproduction. Consequently, the observed waveform, which could not be explained solely by the fault pattern, was reproduced correctly.
PROCEEDINGS OF COASTAL ENGINEERING, JSCE
PROCEEDINGS OF THE JAPANESE CONFERENCE ON COASTAL ENGINEERING
