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Fig. 1. | Earth, Planets and Space

Fig. 1.

From: Analysis of seismic magnitude differentials (mbMw) across megathrust faults in the vicinity of recent great earthquakes

Fig. 1.

Schematic patterns of coherent short-period radiation and large coseismic slip regions for the great 26 December 2004 Sumatra (Mw 9.2), 27 February 2010 Chile (Mw 8.8) and 11 March 2011 Tohoku, Japan (Mw 9.0) earthquakes. Regions of largest fault displacements (yellow) and regions of coherent short-period (~1 s) teleseismic radiation (blue) are indicated. The dashed lines are the position of the subduction zone trench, the thick gray lines are coastlines, and the red stars are the epicenters. In each case the coherent short-period radiation comes from down-dip, closer to the coast (30–50 km deep), while the large slip zones are in the upper 30 km, extending seaward toward the trench. Short-period energy is located by network back-projections, while main slip regions are located by inverting seismic, geodetic, and/or tsunami observations, as described in the text for each event. (From Lay et al., 2012).

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