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Fig. 2. | Earth, Planets and Space

Fig. 2.

From: Frequency-dependent rupture process of the 2011 Mw 9.0 Tohoku Earthquake: Comparison of short-period P wave backprojection images and broadband seismic rupture models

Fig. 2.

Summary schematic map of inferred fault zone rupture segmentation for the 11 March 2011 Tohoku Earthquake. The red star indicates the USGS location of the main event. The one-day aftershock region is indicated by red dots, extending ~500 km along the subduction zone and includes outer rise activity off-shore of the region of large slip. The olive-colored region is where co-seismic short-period radiation with relatively low seismic moment is imaged by teleseismic P-waves. The orange-colored region is where little short-period radiation, but large slip is placed by broadband finite fault inversions of seismic and geodetic data. These are not precise areas, as both methods have uncertainties and limited resolution. Locations of historic offshore earthquake ruptures along the Tohoku coast are indicated with blue ellipsoidal shapes (Kanamori et al., 2006). The approximate location of the 869 Jogan tsunami source region (Minoura et al., 2001) is found to lie within the region of large slip. The magnitude ~7.5 Miyagi-oki and Fukushima-oki earthquakes locate in the down-dip area. The 1896 tsunami earthquake appears to have ruptured similarly to the up-dip region in 2011, but the down-dip portion of the megathrust has not had recent large earthquakes and is also lacking in smaller event activity.

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