Evaluations of Wind Field Estimations for Typhoon Jebi (T1821) by Using Fire Insurance Experience in Kansai Area

Typhoon Jebi (T1821) derived significant damages around Kansai area in Japan and recorded the highest fire insurance payment. Therefore, the accurate estimation of wind field for Jebi is quite important for the future ratemaking. In this study, several models, which are an engineering typhoon model, a meteorological model and combined/maximum of those models were used for the estimation and validated by using measurements at weather stations and compared with fire insurance payment database. Wind speeds obtained from the engineering typhoon model show better agreement with measurements at weather stations than the meteorological model. On the other hand, the wind speed distribution from the meteorological model shows best agreement with damage occurrences in the insurance payment database, and the wind speeds are higher than the engineering model in those area. It is also found that the relation between estimated wind speeds and damage occurrences are slightly improved by considering seismic intensity of the 2018 Osaka earthquake as regression parameters.