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Fig. 4. | Earth, Planets and Space

Fig. 4.

From: Possible large near-trench slip during the 2011 Mw 9.0 off the Pacific coast of Tohoku Earthquake

Fig. 4.

Maps of the Coulomb stress change predicted for model P-MOD2 in Fig. 1. The grid of the fault model is indicated by the rectangle. Two weeks of aftershock locations from the U.S. Geological Survey are superimposed, with symbol sizes scaled relative to seismic magnitude. The known faulting mechanisms are shown in Fig. 1. (a) The Coulomb stress change averaged over depths of 10–15 km for normal faults with the same westward dipping fault plane geometry as the Mw 7.7 outer rise aftershock, for which the GCMT mechanism is shown. (b) Similar stress changes for thrust faults with the same geometry as the mainshock, along with the Mw 7.9 thrusting aftershock to the south, for which the GCMT solution is shown.

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