Disaster Derbis Reduction in the Nankai Trough Earthquake Disaster with Decreasing the Number of Dwelling Based on the Old Earthquake Resistance Building Code

Abstract

The objective of this study is to reveal the effect on disaster debris reduction by the decrease in the number of dwelling house based on the old earthquake resistance building standards. Using an estimation system of disaster debris amount that we developed, the quantity of disaster debris by the earthquake ground motion and tsunami inundation after the Nankai trough earthquake disaster from 2005 to 2018 was calculated. As a result, the amount of disaster debris were estimated at 327.5 million tons as of 2005, 208.0 million tons as of 2018. In addition, it was pointed out that the reduce of disaster debris after the Nankai trough earthquake disaster requires not only the dwelling house seismic retrofitting but also the comprehensive disaster mitigation against the tsunami inundation.