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Fig. 1. | Earth, Planets and Space

Fig. 1.

From: Rupture process of the largest aftershock of the M 9 Tohoku-oki earthquake obtained from a back-projection approach using the MeSO-net data

Fig. 1.

(a) Geographic map showing epicenters of the main shock of the 2011 Tohoku-oki earthquake (gray star) and aftershocks with magnitudes larger than 7 (white stars). Dotted contour lines show the strength distribution of the radiation energy (greater than 50% of the maximum value) for the main shock occurrence which was obtained by Honda et al. (2011) using the back-projection approach. The Japan Trench and the Sagami Trough are shown by dot-dashed lines. Small triangles represent observation sites of the MeSO-net. NA, PHS and PAC indicate the North American plate, Philippine Sea plate and Pacific plate, respectively. (b) The black star is the epicenter of the 2011 Ibaraki-oki event. White stars are epicenters of M 7-class earthquakes which have been regarded as characteristic earthquakes and gray stars show epicenters of large earthquakes (M > 6). Black dots indicate repeating small earthquakes reported by Kimura et al. (2006). A thick dashed line shows the north-eastern end of the PHS that lies on the PAC. Contours by dotted lines and solid lines represent slip distributions of M 7 earthquakes that occurred in 1982 (Murotani et al., 2003) and 2008 (Nagoya Univ., 2008), respectively.

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