We don't have any seismic location resolution here, but if we did, it would be along that fault. These are all thrust earthquakes, and it is much like Turkey.
Whenever you see a big gash like that, it is an active fault. If you had gps around the area, it would be as always -- the highlands go up , and the lowlands go down. For any given area, the odds of this size of earthquake activity is one in 500 years, but the earthquakes go up and down the fault. That is why everybody just stacks up rocks for houses. I also suspect this is a 'blind thrust' earthquake, so that the Peak Ground Velocity is very high, to the point that even building with concrete and rebar would be inadequate.
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