Fig. 1

Distribution of GNSS stations used in this study. Black circles indicate GEONET stations and open circles indicate GEONET stations 950435 and 950445 whose GNSS time series are plotted in Fig. 2. Black dashed contours show the iso-depth of the plate interface between the Philippine Sea and Amurian Plates (Baba et al. 2002; Nakajima and Hasegawa 2007; Hirose et al. 2008). Gray rectangles indicate the boundaries of five segments. (Inset) Tectonic map around the Japanese Islands. PA, PHS, and AM denote the Pacific, Philippine Sea, and Amurian Plates, respectively. Red and blue rectangles indicate the analysis area in this study and the area where the six reference GNSS stations are located, respectively