There was no word of casualties or damage although the quake was widely felt.
Parts of New Zealand lie on the so-called Ring of Fire, a horseshoe-shaped string of volcanoes around the Pacific Rim, where about 90 percent of the world's quakes occur.
Last February the island nation was rattled by a magnitude 6.3 earthquake that killed at least 166 people.
Never forget the bottles that fell from the shelves this day as casualties of the earthquake. #eqnz— Simon Wong (@wimon_song) 24 апреля 2015