FRAGILITY CHARACTERISTIC OF BURIED WATER DISTRIBUTION AND SEWER PIPELINE NETWORK WITH RESPECT TO SURFACE FAULT DISPLACEMENT

Abstract

 In the 2016 Kumamoto earthquake, strong seismic motions characteristic of inland crustal earthquakes and many cracks were generated on the ground surface along several fault zones. The water supply and sewer pipelines in Kumamoto were severely damaged by the earthquake, and although strong ground motions and liquefaction were the dominant causes of this damage, it is necessary to consider the effects of surface fault displacement observed in many areas. In this study, we extracted data from buried water supply pipelines in Mashiki and sewer pipelines in Kumamoto and Mashiki that were damaged by the Kumamoto earthquake, and analyzed the fragility characteristics of water treatment pipelines in relation to the surface fault displacement.