A strong earthquake with a preliminary magnitude of 5.5 jolted the Ibaragi Prefecture near Tokyo on Sunday, Japanese public broadcaster NHK said, but there were no immediate reports of damage or injury.
The earthquake also had no impact on the tsunami-crippled Fukushima nuclear power plant, the Tokyo Electric Power Co. said. No tsunami warning was issued.
The quake struck at about 10:23 a.m. (8:23 p.m. EST) around 130 kilometers (80 miles) north of Tokyo, the Japan Meteorological Agency said, and was felt in the capital. Its depth was around 10 kilometers (6.1 miles).
The U.S. Geological Survey measured the quake with an initial magnitude of 5.2.
On March 11, Japan's northeastern coast was struck by a magnitude-9 earthquake, the strongest quake on record in Japan, and a massive tsunami, which triggered the world's worst nuclear crisis since the Chernobyl event 25 years ago. The disaster left as many as 23,000 people dead or missing.
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.