The epicenter of the 31-mile-deep earthquake was about 137 miles west-northwest of Arawa on the southeast coast of Bougainville Island in Paupua New Guinea, and 508 miles west-northwest of Honiara in the Solomon Islands.
The reading on the earthquake's magnitude came from the U.S. Geological Survey.
There were no initial reports of damages. A tsunami warning was not posted.
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