Within the same system, such as the Sunda trench near Sumatra, one earthquake relieves stress locally, but that produces an increase in stress elsewhere. An increase in activity from Alaska to Chile could mean something big is going on along the entire Eastern Pacific ROF. It bears watching.
I just wonder if we may start seeing more stonger > 7.0 and more frequent earthquakes. That would be very troublesome given the development along the Pacific coast.
Don't forget that the Cascades, Sierra Nevada, Bitteroots, and Rocky Mountains exist because of the tectonic movements. Could we be seeing a new period of significant activity?