Fig. 1

Study area in the northeastern Japan. In A, the blue area denotes the eastern margin of the Japan Sea (EMJS) and the red rectangle identifies the Tohoku District inland area. The blue and red stars indicate the epicenters of the target events in this study, which occurred in the EMJS area and Tohoku District, respectively. B The actual fault plane which was estimated in previous studies. The arrows on the fault plane denote the dipping directions