An earthquake with a preliminary
magnitude of 5.5 hit eastern Japan on Saturday but no tsunami
warning was issued, Japan's national broadcaster said.
There were no reports of immediate damage.
On March 11, 2011 Japan
's northeast coast was struck by a
magnitude 9 earthquake, the strongest quake recorded in the
country, triggering a massive tsunami and resulting in the
world's worst nuclear crisis in 25 years. The disaster left up
to 20,000 dead or missing.