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1) Present Situation and Problem of Earthquake Disaster Prevention Information System After the 1995 Hyogo-ken Nanbu Earthquake, It was recognized again that there is the earthquake which brings locally the heavy damage even if its magnitude is relatively small. The local public bodies are expected to estimate the damage and to form the disaster prevention plan in the future earthquakes which are supposed to occur in each area. Early Estimation System for Earthquake Disaster (EES) has been operated by National Land Agency since April in 1996 to support the local public bodies in the estimation of the damage. Although this system can be applied to every local public body, the damage is estimated by mesh and the detailed setup can not be performed. On the other hand, some local public bodies have their original disaster prevention information systems. In for example, Yokohama-shi, the advanced system (Real-time assessment of earthquake disaster in Yokohama; READY) is built in which the real-time estimation of the damage in an earthquake can be performed with the dense seismograph network and GIS(geographic information system). However, it is almost impossible to apply the same system to another local public body because of the economical reason. Thus several earthquake disaster prevention information systems have been developed and some of them are put into practical use. But in reality most of the small-to-medium sized local public bodies do not have any systems. It is expected to develop the system which is convenient, functional and not expensive, so that many local public bodies can introduce it. Considering the heavy damage by the fire in the 1995 Hyogo-ken Nanbu Earthquake, the function of simulation of spreading fire is to be added to the system. The function of estimation of the damage in a future earthquake and real-time estimation right after the occurrence of an earthquake can be realized in the identical system. The system is considered to be most useful in which the information of every house and building can be managed in the area covered by the local public body. In recent years, the digital residential map produced by such a company as Zenrin Co.Ltd has been available in Japan. It made it possible to develop the disaster information system based on GIS in which every house and building is a target of risk Abstract: The objective of this study is to develop the convenient simulation system of the spreading fires at an earthquake. Generally, it requires a tremendous labor to make the data which are used for this kind of simulation. This system needs some attribute data and the coordinate of each residence which can be picked up with a digital residential map in a simple manner besides the data about the wind direction, wind velocity and seismic intensity. A work file is produced with the basic data and the simulation of the spreading fire is formulated as the shortest route problem, which is solved by the Dijkstra’s algorithm. The results of the simulation can be shown on the digital residential map of computer display.

Construction of Convenient Simulation System of Spreading Fire at an Earthquake Using Digital Residential Maps