CASE STUDY ON POTENTIAL DAMAGE AND THE DAMAGE CHARACTERISICS BY THE MULTIPLE DISASTER OF EARTHQUAKES AND FLOODS

Abstract

In this study, we proposed a procedure for estimating the potential damage caused by multiple disasters, and consideration points for countermeasures against the multiple disasters. We assumed a multiple disaster in which a flood occurs after an earthquake, and estimated the potential damage in a river (about 60km length). We estimated each damage in 12 cases changing the interval between the earthquake and the flood, and the scale of the earthquake. We also estimated the days required for the emergency works for the levees and roads, and the emergency rescue activities after the earthquake. We analyzed the risk in each period of the emergency work duration, and found that not only decreasing the damage caused by the earthquake, but also shortening the length of emergency work duration was important to reduce the damage caused by the multiple disaster.