There was no immediate report of injuries or damage.
The Pacific Tsunami Warning Center posted no warning or watch, but said on its web site: "There is a very small possibility of a local tsunami that could affect coasts located usually no more than a hundred kilometers (62 miles) from the earthquake epicenter."
The USGS said the quake at a depth of 15.3 miles struck around 9:30 a.m. local time Friday off the south coast of Papua, 64 miles north of Dobo on the Aru Islands.
Indonesia sits on a vulnerable quake-prone zone called the "Pacific Ring of Fire," where two continental plates meet and cause frequent seismic and volcanic movements.
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