Abstract
On March 11, 2011, after the occurrence of the 2011 off the Pacific coast of Tohoku Earthquake, the operation of railway system in Tokyo metropolitan was suspended for a long time so that huge number of people got into difficulties in moving. Meanwhile, some people began returning home under the situation whether he/she can return home safely. Furthermore, some people put himself/herself in unsafe situation by spending night in the open air. To clarify the situation when the people had begun returning home is significant in order to consider the measures to Tokyo metropolitan inland earthquake which is expected to occur in near future.
Therefore, the timing when the people started returning home was focused in this study. An internet survey was conducted to collect the data regarding the behavior of the people who had difficulties in moving on the day. Moreover, the data regarding the restart time of railway operation was collected from railway companies.
It is confirmed that the most people started returning home before the railway service on the way had not been fully restored and that success rate of returning home for the people who did not use railway service was relatively low.
