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Earth, Planets and Space
Fig. 1. | Earth, Planets and Space

Fig. 1.

From: Seismicity near the hypocenter of the 2011 off the Pacific coast of Tohoku earthquake deduced by using ocean bottom seismographic data

Fig. 1.

Tectonic setting. The black and gray stars indicate the 2011 mainshock (March 11, 2011) and the largest foreshock (March 9, 2011) epicenters, respectively. Stations are shown by colored (OBSs) and blue (onshore stations) inverted triangles. (a) Map of the study area. The rectangle represents the Miyagi-oki region. The black arrow shows the direction of the Pacific and North American plate convergence (DeMets et al., 1994). (b) Map view of station distribution in the Miyagi-oki region shown in Fig. 1(a). The rectangle shows the foreshock area discussed in this study. Rupture areas of the mainshock (Lay et al., 2011) and the 1978 earthquake (Yamanaka and Kikuchi, 2004) are shown by the black contour. The black line is the Japan Trench.

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