Verification of Fault Models of the 1946 Showa-Nankai Earthquake Based on Actual Accounts

Abstract

This study discusses the validity of fault models proposed for the 1946 Showa-Nankai Earthquake based on the actual accounts of people who experienced the earthquake. Testimonies that mention ground shaking during the earthquake were collected from Wakayama, Tokushima and Kochi. It was found that testimonies are consistent with the fault models proposed ever, describing different patterns of shaking in different regions. Simulation of ground motions is also conducted to further verify the fault model. Assuming the asperities and the fault rupture process, the simulated motions are capable of describing testimonies with reasonable accuracy. However, collecting a greater number of testimonies may be necessary for further modifications of the fault model.