A 4.8 magnitude quake struck parts of Japan's Ibaraki prefecture, northeast of Tokyo, the weather agency said on Saturday.
The temblor occurred at 10:52 a.m. local time at a depth of 50 km, measuring 4 on Japan's seismic intensity scale which peaks at 7, Xinhua news agency reported quoting the Japan Meteorological Agency (JMA).
It was epicentred at off Ibaraki at a latitude of 36.5 degrees north and a longitude of 140.8 degrees east.
No tsunami warning has been issued.
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