Abstract
In this study, geographical data on the road network downloaded from OpenStreetMap and altitude data from the Geographical Survey Foundation Map were used to quantify the possibility of isolation of a village during earthquake in a mountainous area. The possibility of isolation was defined by the probability of disconnection of the road network between a settlement and the local government office in the target area. The probability of failure of nodes and links constituting the road network was evaluated by using the probability of slope failure that was calculated with the equation by Sakai et al. (2013). The disconnected probability of the road network was calculated by the Monte Carlo Method. For the evaluation by the constructed method, the influences of countermeasure works and the difference of the digital elevation model to be used were discussed. Furthermore, the advantages and disadvantages of using OpenStreetMap on the evaluation of isolation possibility of earthquake in the mountainous area were summarized.
