Fig. 8.From: Seismicity near the hypocenter of the 2011 off the Pacific coast of Tohoku earthquake deduced by using ocean bottom seismographic dataHistogram of the relative depths of the foreshocks that occurred in the foreshock area (Fig. 1(b)) and between −30 and 0 days before the mainshock, measured from the plate boundary modeled by Ito et al. (2005).Back to article page