2022 Volume 77 Issue 5 Pages I_173-I_180
When aftershock of the Hokkaido Eastern Iburi earthquake struck on February 21, 2019, there were a flood of people waiting for the restoration of public transportation in central Sapporo, including Sapporo Station. Estimating the number of people who have difficulty returning home, including the disaster scenario in winter, considering the difference in the timing of the disaster is indispensable for building an emergency evacuation system. Many existing studies on the estimation of the number of people who have difficulty returning home have been reported using the national census and the person trip survey (hereinafter referred to as the PT survey). However, considering the population staying at each time and from a distance, no analysis was found for each mesh unit by means of returning home or activity purpose. Therefore, in this study, we estimated the number of people who have difficulty returning home and visualized the spatial distribution of the number of people who have difficulty returning home. By using PT surveys, mobile phone location information data (mobile spatial statistics), and each evacuation center and area in Sapporo City.
