Fig. 3

a1 Vertical displacement velocity of the Kanto Plain derived from GEONET during January 2005 to December 2010 (the period before the 2011 Tohoku earthquake). The continuous displacement in Fig. 2a was subtracted from all maps. Black dots are the locations of the GPS stations. a2 Enlarged views around the center-south of the Kanto Plain (corresponding to the dashed rectangles in Fig. 2a1). A reference point is set at the northeast corner of the Kanto Plain, where the surface displacement was relatively stable after the earthquake. In the figure for 2010, a reference point is set south of the reference point for other figures, because subsidence has been observed only in the period. b1 Vertical and horizontal displacement velocity during April 2011 to December 2015. b2 Enlarged views around the center-south of the Kanto Plain (corresponding to the dashed rectangles in Fig. 2b1). The reference point is the same as a2. Black rectangles in 2011 and 2012 are the covered areas of TerraSAR-X images