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Magnitude 6.9 earthquake strikes off Japanese coast, USGS says An earthquake hit northern Japan on Tuesday, the Japan Meteorological Agency said, issuing tsunami advisories for much of the nation's northern Pacific coast. The epicenter of the earthquake, which was felt in Tokyo, was off the coast of Fukushima prefecture at a depth of about 10 km, the agency said. The U.S. Geological Survey had a preliminary magnitude of 7.3, but then revised the figure down to 6.9. The Associated Press reported that the waves may be up to about 10 feet in height. Fukushima prefecture is north of Tokyo and home to the nuclear power plant that was destroyed by a huge tsunami following an offshore earthquake in 2011. Tohoku Electric said that it found no abnormalities at its Onagawa nuclear power plant after the earthquake. There were no immediate reports of damage or injury. U.S.-dollar denominated Nikkei futures turned negative after the news. The dollar also fell against the yen, but quickly rebounded.