The quake hit 115 kilometers (72 miles) northeast of Mount Hagen in the western highlands, the Pacific nation’s third largest city, at a depth of 77 kilometers.
Geoscience Australia said it could have been felt in the city, but it was too far away and too deep to cause much damage.
Strong earthquakes are common in impoverished PNG, which sits on the so-called “Pacific Ring of Fire”, a hotspot for seismic activity due to friction between tectonic plates.
A giant tsunami in 1998 killed more than 2,000 people near Aitape, on the country’s northwest coast.
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