Real-Time Control System for Civil Infrastructures during a Seismic Disaster

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With the recent improvements in computer technology, information network systems, etc., "Real-time control system for civil infrastructures during a seismic disaster", which utilizes real-time information to mitigate earthquake loss, has become realistic as a new method of disaster mitigation. To reduce earthquake loss, proper pre-, ongoing and post-earthquake countermeasures are indispensable. Conventionally, pre-countermeasures have been taken based on many assumptions such as the location, magnitude and occurrence time of an earthquake, weather condition, season, etc. The manuals for emergency operations are based on the simulation results for scenario earthquakes. These are useful for the government and municipalities to know the approximate damage level and to make disaster mitigation plans. However, because of the numerous assumptions employed, these results often differ from actual ones and it is very difficult for the general public to have the image of disasters.It is also emp … More hasized that the ongoing information on a disaster is highly important for efficient crisis management. But no proper tools to gather real-time information had existed before the 1995 Kobe Earthquake except for few pioneer systems. After the Kobe Earthquake, various national and municipal organizations in Japan began to develop or strengthen real-time earthquake disaster information systems. However, basic databases and methodologies used in such systems still need to be upgraded and an information sharing system has not been established yet.This research project aimed to develop fundamental theories and technologies used for the prototypes of real-time disaster mitigation systems for civil infrastructures and built environment, notably for water supply systems and expressway networks, by making best use of strong motion estimation methods, damage assessment methods, GIS, Internet, satellite remote sensing and other new tools.Research items of the four-year project consisted of three major fields with 12 sub-topics :(a) Basic data and information for real-time disaster mitigation systemsa1) Bedrock structure modeling based on microseisms, a2) Dynamic soil modeling using GIS, a3) Development of fragility curves for lifeline systems, a4) Development of fragility curves for buildings, a5) Dynamic characteristics and seismic performance of buildings(b) Methodologies for real-time disaster mitigation systemsb1) Stochastic interpolation of earthquake ground motion , b2) Spatial variation modeling of ground deformation, b3) Disaster propagation model in space and time(c) Development of practical tools for real-time disaster mitigation systemsc1) Real-time damage estimation and control of lifeline systems, c2) Application of GIS to Internet , c3) Real-time communication tool using mobile GIS and GPS , c4) Remote sensing for earthquake damage detection Less