The quake hit in the early hours of this morning at a depth of 35 kilometres.
The epicentre was about 96 kilometres south-west of Mendi, the capital of Southern Highlands province, a town of more than 50,000 people.
It is not clear yet if there are any casualties, but Don Blakeman from the United States Geological Survey (USGS) said significant damage was likely.
“Any geologic situation like steep valleys or any type of construction, [like] buildings, mines, that sort of thing, since this is a shallow earthquake it shakes all of that a lot more,” he told the ABC.
Powerful earthquake hits Papua New Guinea
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Huge earthquake strikes off Papua New Guinea
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Papua New Guinea hit by 7.5 earthquake
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Major earthquake strikes Papua New Guinea
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Powerful Quake Rocks Papua New Guinea
A powerful 7.5-magnitude earthquake struck Papua New Guinea early Monday, with unconfirmed reports of blackouts and damage to buildings, officials said.
A map showing the “Ring of Fire,” where more than half of the worlds active volcanoes above sea level encircle the Pacific Ocean. (USGS)
5:29 Newsbreak – February 2 11:13 Newsbreak – September 14 5:13 Newsbreak – February 26 1:25 Michael McCormack set to replace Barnaby Joyce as deputy PM 12:43 News Headlines: Monday 26 February 25:49 Countdown to closing ceremony 3:00 Australian Spartan FINALLY here! 6:28 News Headlines: Sunday 25 February 5:54 News Break – February 25 6:53 News Headlines: Saturday 24 February 1:58 Whalecam reveals secrets of Antarctic minke 5:17 Newsbreak – December 24 The quakes epicentre was around 90 kilometres (55 miles) south of Porgera in Enga province, according to the US Geological Survey, and hit at a depth of 35 kilometres.
The quake hit PNGs mountainous interior and US scientists said there was no tsunami threat.
Felix Taranu, a seismologist at the Geophysical Observatory in the capital Port Moresby said the quake was felt strongly at Mount Hagen, some 168 kilometres away.
A 7.5-magnitude earthquake struck Papua New Guinea early Monday. Source: USGS