As described in this paper, we analyzed the influence of the time necessary to begin coping behaviors on the damage caused by chemical terrorism. To calculate the damage of a chemical attack in a major rail station, our network model-based pedestrian simulator was applied with systems designed to predict hazards of indoor gas diffusion. Our network model is designed to conduct simulations much faster, taking less than few minutes for simulation with ten thousands of evacuators. With our evacuation planning assist system, we investigated a simulated chemical attack on a major rail station. In our simulation, we showed a relation between the time necessary to begin coping behaviors of the managers and the damage to passengers. Results of our analyses were used for the instruction of rail station managers in a table-top exercise held by the Kitakyushu City Fire and Disaster Management Department.
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