The preceding decade was characterized by the abrupt increase of the number of large earthquakes (Mw≥8), with the occurrence of three of the six strongest seismic events recorded in the period of instrumental seismology (2004 M 9.0 Sumatra–Andaman earthquake; 2010 M 8.8 Maule, Chile, earthquake; 2011 M 9.0 Tohoku, Japan, earthquake [Shearer and Stark, 2012]). Many authors analyzed seismicity back to 1900 to assess whether large earthquakes either cluster in time or follow a random distribution (Daub et al., 2012, and references therein) but reached contradictory conclusions (Kerr, 2011). We...

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