There were no immediate reports of injuries or major damage, and whether the quake would trigger a tsunami warning was unclear.
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The earthquake's epicenter was located in the Pacific Ocean, about 115 miles southeast of city of Hirara on Japan's island of Miyako, the USGS said. It occurred at 11:45 p.m. local time and its depth was measured at just over 6 miles.
Great California ShakeOut: LA Metro unveils earthquake early warning system
Great California ShakeOut: LA Metro unveils earthquake early warning system
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DEVELOPING: More details will be added to this report as they become available.