Almost five years after the 12 May 2008 Mw 7.9 Wenchuan earthquake, the Longmenshan fault zone was struck by the April 20 Mw 6.6 Lushan earthquake, with its hypocenter located ∼45  km southwest of the southern end of the Wenchuan surface rupture (Han et al., 2014; Zhang et al., 2014; Fig. 1). Such proximity in space and time between the two events implies that the later event is an aftershock of the previous one, or in other words, the previous event played a more important role in the occurrence of the latter...

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