Map showing the distribution of the epicenters of the 2011 Tohoku-oki earthquake sequence and nodes used in slip inversion. Stars denote the locations of the epicenters of the foreshock, mainshock, and aftershocks. Open circles denote nodes used in slip inversion. Broken lines denote the depth contour of the subducting plate interface with an interval of 10 km. Solid squares denote the locations of sites whose time series are shown in Figs. 5, 14 and 22.