The U.S. Geological Survey said on Wednesday that a magnitude 3.1 earthquake in southern New Zealand’s Taranaki region on Monday morning had caused damage to a power substation and that three people were confirmed dead.
The quake, at a depth of 6.9 miles (10.5 kilometers), was centered about 30 miles (50 kilometers) south of the town of Otaki and struck about 8:50 a.m. local time (1:50 p.m., EDT).
A tsunami warning remained in effect for coastal areas.
The U.K. government also said it had warned of a tsunami in the area.
There was no immediate information on injuries or fatalities.
A small earthquake in the Pacific Ocean off the coast of California in February killed two people.
The Pacific Tsunami Warning Center in San Diego said the quake occurred about 6 miles (11 kilometers) west of the coast.
It was centered at a shallow depth of about 3 miles (5 kilometers).