TOKYO (Reuters) - An earthquake measuring 6.3 struck off the eastern coast of Japan on Friday, the U.S. Geological Survey said.

There were no immediate reports of casualties or damage.

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The quake struck 300 km (180 miles) east of Iwaki, Honshu, at a depth of 77.8 km, USGS said.

(Writing by Nick Macfie; Editing by Kim Coghill)