A slip model by Ching et al (2011) for the 2010 quake colored squares) shows slip on a blind thrust fault. This is a large area and a small slip for a M=6.3 shock, and so perhaps the actual rupture was more compact. Nevertheless, the 2016 M=6.3 shock strikes at the periphery of the 2010 rupture, which was likely brought closer to failure.
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