A double earthquake in New Zealand

A 5..2R and a 4.6R events have been registered this morning (GMT) in Cook Stait New Zealand. The events were separated in time by 25 minutes.
We were expecting this event tomorrow 30th December, see NZ calendar, so it is early by a day.
Magnitude

	mb 5.2
Region	COOK STRAIT, NEW ZEALAND
Date time	2016-12-29 02:34:33.6 UTC
Location	41.75 S ; 174.55 E
Depth	20 km
Distances	55 km S of Wellington, New Zealand / pop: 382,000 / local time: 15:34:33.6 2016-12-29 2288 km S of Nouméa, New Caledonia / pop: 93,100 / local time: 13:34:33.6 2016-12-29 2320 km SE of Canberra, Australia / pop: 328,000 / local time: 13:34:33.6 2016-12-29