Fig. 1.
From: Nearly complete stress drop in the 2011 Mw 9.0 off the Pacific coast of Tohoku Earthquake
P and T axis distributions of earthquake focal mechanisms (a) before and (b) after the 2011 Tohoku earthquake projected on a vertical plane perpendicular to the trench axis. P and T axes for earthquakes in the rectangle region in the inset map are plotted. Focal mechanisms are from the seismic moment tensor catalogue by the NIED. P- and T-axes are shown by red and blue lines, respectively. Orange horizontal lines and red triangles on the top show the locations of the land area and active volcanoes, respectively. Inclined lines denote the upper plate boundary.