Abstract
It is observed that the lack of open spaces became a serious issue, which lead to the problem of disaster prevention in the urban areas of Japan . After The Great Hanshin Earthquake, it is realized the necessity of keeping safety places in residential environment in the form of open spaces in urban areas . Therefore, the aim of this study is to make some suggestions in order to improve the situation of open space from the viewpoint of disaster prevention in Tokyo region. In this study, first, the authors tried to evaluate the present situations of open spaces in both district and regional level using Geographical Information Systems (GIS). Then, the authors suggest the way to improve open spaces from the viewpoint of disaster prevention in Tokyo. The main results are as follows: (1) It is necessary to improve both of small open spaces and large open spaces in balance. (2) It is essential to improve open spaces in response to nighttime population and daytime population in each area.
