2024 Volume 80 Issue 17 Article ID: 24-17076
Regarding the source of the Noto Peninsula Earthquake Tsunami in Reiwa 6, several studies assumed a source of approximately 150 km in length based on the distribution of aftershocks immediately after the main shock. However, few cases reflect the results of previous fault investigations and the actual tsunamis that reached various areas. In this study, we attempted to estimate the active area based on the propagation characteristics of tsunamis caused by segmented sources and corresponding temporal waveforms. As a result, it became clear that the northeast offshore area can be explained by a southeast-dipping source along the north coast of the Noto Peninsula, based on the tsunami arrival times in the areas such as Iida-machi, Suzu city. It was also revealed that it is not necessary to consider a northwest-dipping source. Based on the distribution of uplift and subsidence, it was considered that the source off the Sasanami coast on the west coast of the Noto Peninsula was not active in this event. From the above, the length of the source area for this earthquake tsunami was estimated to be approximately 100 km.
