DAMAGE TO GAS DISTRIBUTION PIPES IN TOKYO METROPOLITAN AREA AFTER THE 2011 GREAT EAST JAPAN EARTHQUAKE

Abstract

 This study investigates the damage ratios of gas distribution pipelines in Tokyo Metropolitan area after the 2011 off the Pacific coast of Tohoku earthquake. The relationship between the damage ratios and spectrum intensities (SI), which were observed by a real-time earthquake monitoring system, SUPREME, operated by Tokyo Gas Co., Ltd., is evaluated. A fragility function for gas supply pipes is newly developed by this study. The effects of topographical conditions on the damage situations of gas distribution pipelines are also investigated. More damage incidents to gas pipes are expected in the valley bottom lowland.