Earthquake Safety of Natural Gas Systems - Analysis of Data from the 17 October 1989 Loma Prieta Earthquake

本项目涉及所吸取的经验教训， 1989年10月17日北方加州 (Loma普列塔）地震。 它遵循一个“快速 “回应”奖作出了夫人和摩尔为 收集易腐烂的数据， 地震 洛马普列塔地震影响了 几乎所有类型的性能 是旧金山弗朗西斯科湾区的生命线 包括天然气系统。 天然气 系统受到严重影响， 严重的接地故障，如在 滨海区，那里发生了几起大火 在最初的地面震动后爆发。 那里 担心不受控制的火灾 是因为该地区的煤气泄漏 幸运的是， 火势被控制住了， 替代水源。 本项目的目的是研究 地震对当地天然气的影响 系统. 具体来说，它分析了数据 作为“快速反应”的一部分收集 为了开发更好的地震风险， 天然气系统的评价模型，以及 为了确定现有的安全装置， 例如地震截止阀，是可行的 减轻整体地震的方案 损失 对这些数据的分析建立在有限的 这些研究已经存在。 性能数据的比较， 事件与1971年San 费尔南多和1987年惠蒂尔海峡 地震对于量化 区域差异导致的业绩差异 因素和地震防备水平。

This project addresses the lessons learned from the 17 October 1989 Northern California (Loma Prieta) earthquake. It follows a "quick response" award made to Dames and Moore for the collection of perishable data from the earthquake. The Loma Prieta earthquake affected the performance of virtually every type of lifeline in the San Francisco Bay Area, including natural gas systems. Natural gas systems were severely affected in areas of significant ground failure, such as in the Marina district, where several large fires erupted after the initial ground shock. There was concern that uncontrolled fires would be fueled by gas leaks in the area. Fortunately, the fires were contained by utilizing several alternative water sources. The aim of this project is to study the effects of the earthquake on local natural gas systems. Specifically it analyzes the data collected as part of the "quick response" award, in order to develop better seismic risk evaluation models for natural gas systems, and to determine whether existing safety devices, such as seismic shutoff valves, are a feasible solution for mitigating overall earthquake losses. An analysis of these data builds upon limited studies which already exist for these systems. A comparison of performance data from this event to similar data from the 1971 San Fernando and the 1987 Whittier Narrows earthquakes is critical in order to quantify differences in performance due to regional factors and level of earthquake preparedness.