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                <p>TOKYO (Reuters) – A strong earthquake with a preliminary magnitude of 7.2 hit off the coast of northeastern Japan on Wednesday, the Japanese Meteorological Agency said.</p>
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A tsunami warning of up to 50 cm was issued for northeastern Japan, public broadcaster NHK reported. Buildings shook in Tokyo but no damage was immediately reported.</p>
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The focus of the tremor was 10 km (6 miles) below the surface of the earth, off the coast of Aomori prefecture, NHK said.</p>
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Tohoku Electric Power said its Onagawa nuclear plant was operating normally after the quake. Tokyo Electric Power also said there was no impact on its power plants in the region.</p>
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Earthquakes are common in Japan, one of the world's most seismically active areas. The country accounts for about 20 percent of the world's earthquakes of magnitude 6 or greater.</p>
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(Reporting by Yoko Kubota; Editing by Nathan Layne)</p>
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