A RISK ASSESSMENT OF LOGISTICS DEGRADATION DUE TO THE NANKAI TROUGH EARTHQUAKE ALONG THE COAST AREA IN OSAKA BAY

Abstract

 Osaka bay area are concerned that they will suffer tremendous tsunami due to the Nankai Trough Earthquake which is believed to occur reliably in the near future. In this area, highways, national routes and major provincial roads are constructed along the coast, and transportation and logistics networks essential to securing the lives of local residents are being formed. In this study, we investigated the risk of tsunami damage at river bridges and major traffic nodes in the coastal area of the Osaka bay area using the damage estimation of the Nankai Trough massive earthquake by the Cabinet Office in 2012. As a result, it was revealed that river bridges and transportation nodes potentially inundated become bottlenecks of ambulance transport and transportation of relief supplies. Moreover, we found that there are spots in the main roads of coastal areas that are difficult to use as evacuation routes. In addition, it showed that there is a possibility that traffic and logistics functions may be interrupted due to inundated area near the entrance on highway with seismic reinforcement reinforced.