No tsunami warning was issued and NHK national television said that while there might be some changes in sea level, no tsunami damage was expected.
6.1 quake hits off northern Japan
There were no immediate reports of damage.
On March 11, 2011, the northeast coast was struck by a magnitude 9.0 earthquake, the strongest quake in Japan on record, and a massive tsunami. Those events triggered the world's worst nuclear crisis since Chernobyl a quarter of a century earlier.
Aggravated misery: Quake victims pay bribes to receive compensation
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