The quake struck about 55 miles southwest of Porgera in the Pacific island nation at a depth of about 23 miles, according to the agency.
There were no immediate reports of damage.
ExxonMobil and Oil Search have shut down their liquefied natural gas (LNG) operations and facilities in Papua New Guinea after an quake hit the country's Highlands this morning.
Iran: We will flatten Tel Aviv if attacked
The Iranian warning comes days after Israel warships destroyed Tehran-supplied anti-aircraft batteries in Syria used in an unprovoked attack against the Israeli Air Force.
Papua New Guinea sits on the Pacific Ring of Fire, an area known for seismic upheavals and volcanic eruptions.
Geological Survey geophysicist Paul Caruso says the quake, which had a depth of 35 kilometers (22 miles), occurred in a rural, jungle area near a mountain range.
Japan's natural disaster occurred some 78 miles from Honshu off the island's east coast but was felt in several cities including Tokyo and Fukushima.
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