If, IF, the AU/NZ quake is a 7.+(well, even if it's "just" the 6.6 initially reported) & IF the timing reported is correct there is NOTHING "normal" or "usual" about it, not even close. Two 6.6+ quakes, minutes apart in 2 different, though tectonically(?sp) connected regions, is far, FAR from "normal", though it may BECOME the new "normal" in the days ahead. Not going to break out the "fasten your seatbelts" sign just yet, though you might want to put your trays in the upright & locked position ;-)