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Development of Real-time Disaster Mitigation Systems for Urban Lifelines

@To avoid secondary disasters after earthquakes, a dense seismic monitoring and damage assessment system for a large-scale city gas network was developed as a joint research with Tokyo Gas Co. for the Tokyo Metropolitan area. The monitoring system consists of 3,700 seismometers and gas pressure/flow meters at district regulators. The values monitored by these sensors are sent to the supply control center by radio and digital telecommunication lines. If an earthquake occurs, the damage estimation of customers' buildings and pipelines is conducted and the results are used to control the natural gas supply system. This system is the pioneer of early damage assessment systems for lifelines in Japan. The functional loss assessment of other lifeline systems, e.g., power, water, telecommunications, is also being investigated.