REGIONAL CHARACTERISTICS OF TSUNAMI AMPLITUDES IN JAPAN WITH VARIOUS FAULT PARAMETERS

Future tsunami events include a variety of uncertainties. Especially on megathrust earthquake tsunamis, the tsunami hazard intensity at coastal cities highly depends on the source characteristics such as fault width, length, slip distribution, and location of the large slip area. To facilitate these statistical uncertainties, many studies on probabilistic tsunami hazard assessment (PTHA) have been conducted considering numerous source scenarios. However, these PTHA studies typically consider fixed subfault geometry. In addition, subfault depths are mostly based on geological surveys or analysis of historical earthquake events. However, the results may have some uncertainty. It is important to quantitatively estimate the effect of the uncertainty on tsunami height in coastal areas. This study aims to quantify the sensitivity of fault depth and rake to the coastal tsunami height. The target earthquake source is the subduction zone along the Nankai Trough, located southwest of Japan.