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Earth, Planets and Space
Fig. 2. | Earth, Planets and Space

Fig. 2.

From: Coupling coefficient, hierarchical structure, and earthquake cycle for the source area of the 2011 off the Pacific coast of Tohoku earthquake inferred from small repeating earthquake data

Fig. 2.

Interplate coupling coefficient estimated from small repeating earthquakes for the period from 1993 to March 2007 (color). Distribution of small repeating earthquakes (black dots) and coseismic slip area (contours, Iinuma et al. (2011)) are also shown in this figure. Bold lines denote the down-dip limit of interplate earthquakes (Igarashi et al., 2001; Uchida et al., 2009) and the trench axis. Dashed bold line denotes northeastern limit of the Philippine Sea plate (Uchida et al., 2009). The averaged coupling coefficient is estimated for every 0.3 degree by 0.3 degree windows that have three or smaller repeating earthquake groups. The red star indicates the hypocenter of the 2011 Tohoku earthquake. Stars marked by M, F and A indicate the hypocenter of the 2005 Miyagi-oki earthquake (M 7.2), the M 7.3 earthquake on March 9, 2011 and the largest aftershock on March 11, 2011 (M 7.7), respectively.

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