Tsunami alert after new Japan quake
Japan has been rattled by a strong aftershock and tsunami warning nearly a month after a devastating earthquake and tsunami flattened the north-eastern coast.
The Japan meteorological agency issued a tsunami warning for a wave of up to one metre. The warning was issued for a coastal area already torn apart by last month's tsunami.
Officials say the new quake was a 7.4-magnitude and hit 40km under the water and off the coast of Miyagi prefecture. The quake that preceded last month's tsunami was a 9.0-magnitude.
Buildings as far away as Tokyo shook for about a minute.
The US Geological Survey gave the preliminary magnitude as 7.4 and it struck off the eastern coast 100km from Sendai and 140km from the stricken Fukushima nuclear plant. It was about 345km from Tokyo.
The depth was 40km. Shallower quakes tend to be more destructive.
Hundreds of aftershocks have shaken the north east region devastated by the March 11 earthquake, but few have been stronger than 7.0.