An earthquake with a preliminary magnitude of 5.2 shook eastern Japan on Tuesday, but no tsunami warning was issued and there were no immediate reports of damage.
The quake, centered east of Tokyo, shook buildings in the capital but was not strong enough to dislodge items from shelves.
The earthquake logged 4 on the Japanese seismic intensity scale of 7 in parts of Chiba Prefecture and 3 in some areas of Tokyo and Kanagawa Prefecture, the agency said.
Earthquakes are common in Japan, one of the world's most seismically active areas. Japan accounts for about 20 percent of the world's earthquakes of magnitude 6 or greater.
On March 11, 2011, Tohoku was struck by a magnitude-9 quake, the strongest on record in Japan, and a massive tsunami. Those events triggered the world's worst nuclear crisis since Chernobyl, a quarter of a century earlier.