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

Fig. 1.

From: Spatio-temporal distribution of seismic moment release near the source area of the 2011 Tohoku-Oki earthquake

Fig. 1.

Historical earthquake source areas along the Japan Trench and the distribution of aftershocks of the 2011 Tohoku earthquake. Gray areas indicate the distribution of the rupture areas of large shallow earthquakes (depth ≤60 km) with a magnitude of 7 or greater (1926–1987) (Umino et al., 1990; Ammon et al., 2011). Purple contours indicate the source areas of the 1968 Takachi earthquake and the 1989, 1992 and 1994 ultra-slow earthquakes (Kawasaki et al., 2001). Beach balls show the focal mechanisms of the aftershocks of the 2011 MW 9.0 Tohoku earthquake. Black stars are epicenters with a MW ≥ 7 along the Japan Trench from the GCMT catalog for the period from January 1976 to November 2011. Blue dashed lines show the slab geometry (Nakajima and Hasegawa, 2006).

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