The temblor occurred at 8:00 a.m. local time, with its epicenter at a latitude of 36.5 degrees north and a longitude of 140.6 degrees east, and at depth of 80 km.
The JMA revised its preliminary report of magnitude 5.4 to 5.2 minutes after the quake struck.
The quake logged 4 in some parts of Ibaraki Prefecture on the Japanese seismic intensity scale which peaks at 7.
So far no tsunami warning has been issued.
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