The quake's epicenter was 35 km (22 miles) southeast of St Arnaud, a small town in the north of the country's South Island, at a depth of 62 km (13 miles), according to Geonet's website.
No reports of casualties, major damage after Spain earthquake
Reuters witnesses felt shaking in Wellington, which has a population of around 450,000. There were no initial reports of damage or injury.
Earthquakes are common in New Zealand, whose two islands lie along the Australia-Pacific tectonic plate boundary. A shallow 6.3 magnitude earthquake devastated the South Island's Canterbury region in 2011, resulting in nearly 200 deaths and leveling Christchurch, the country's second largest city.
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