SEISMIC RISK ANALYSIS FOR CITY GAS NETWORK IN SOUTHERN KANTO AREA, JAPAN

摘要

We constructed a detailed seismic hazard model which shows possibility of ground motion during specific length of time, on every 50m square mesh based on recent knowledge of seismology. The superposition of seismic hazard data and damage estimation system on the GIS map makes it possible to calculate seismic risk of large-scale networks such as city gas supply networks. This paper introduces the recent development of GIS-based seismic hazard assessment to evaluate seismic risks for city gas networks, and the examples of its application are demonstrated. The result shows that 1) preventive measure for low pressure which have enormous length should be avoided because they constitute overspending. 2) In contrast, emergency response measure for the low-pressure networks is cost-effective.