12.Realtime Earthquake Damage Estimation System in City Gas Network : SIGNAL

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  • 12.都市ガス施設における地震時リアルタイム被害推定システム : SIGNAL

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Tokyo Gas supplies city gas to 8 million customers around Tokyo metropolitan area and has social responsibility to secure safety even after big earthquake. To prevent gas-caused secondary disaster, it is necessary to make prompt and reasonable decision. For this purpose, SlGNAL (Seismic Information Gathering Network Alert system) has been developed lo support to make decision and has been in operation since June,1994. One of SIGNAL'S function is quick monioring of SI readings and seismic acceleration at 331 locations.acceleralion waveforms at 5 locations and rising ground water levels at 20 locations considered most at risk form ground liquefaction.using a reliable radio network. This real-time earthquake data is linked to data bases of gas pipelines and ground conditions to give an accurate damage assessment,based on pipe-damage experiences suffered in previous earthquakes. The assessment of damage to the gas network is useful for the rapid implementation of emergency work and in drawing up efficient and accurate restoration pians.

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