[en] The Japanese government (Ministry of Education, Culture, Sports, Science and Technology) has declared its interest in the International Linear Collider (ILC) project to other governments and expressed a willingness to continue discussions. This is an important step toward receiving a green light. In order to achieve stable ILC operation, it is necessary to study the effects of ground deformation. We therefore examined data on ground deformation from electronic reference points located near the Kitakami granitic rock body, which is a candidate site for ILC. Data from these electronic reference points are released by the Geospatial Information Authority of Japan (GSI). The effects of earth tides and ground deformation were studied using these data. We considered the impact of ground deformation on ILC operation by comparing displacement of electronic reference points near the ILC candidate site with surrounding electronic reference points. (author)