Shear English - Authorities in north-east Japan ordered a general evacuation and workers at the damaged Fukushima Daiichi nuclear plant took shelter after an earthquake triggered a new tsunami warning. However, the tsunami warning was lifted after 90 minutes and the earthquake - with a magnitude of 7.1 - did little obvious damage. Fukushima officials said the quake had no detectable effect at the plant. Last month's 9.0 earthquake set off a tsunami which devastated the region.
Shelter
The earthquake - at a depth of 49km (32 miles) - struck off Japan's north-east coast, close to the epicentre of the 11 March quake. All seven of the workers at Fukushima Daiichi were safe, a spokesman for plant operator Tepco told a news conference in Tokyo. "They have not been injured and they have all taken shelter in our seismic-resistant building. We are continuing to inject water, or we are continuing the injection operation at reactors 1, 2 and 3," said the spokesman, whose name was not given.
The workers are trying to keep the damaged reactors cool to stop further releases of radioactive material. Thursday's quake struck at 2332 local time (1432 GMT) on Thursday, 118km (78 miles) north of Fukushima, 40km offshore.
First reports said it had a magnitude of 7.4 but that was later revised downwards to 7.1, according to the US Geological Survey (USGS). Last month's earthquake had a magnitude of 9.0 and struck at 32km deep. USGS geophysicist Paul Caruso said Thursday's quake struck at about the same location as the 11 March quake, the AP news agency reported. The quake was strong enough to shake buildings in Tokyo, 265km to the south.
"The earthquake was moving in an up-and-down motion," Miri Gono in Tokyo told the BBC by e-mail. It started off with small shakes, then shook bigger. I was alone in my house with my brother and we were so scared... We took our bottles of water and hid under the table."
Japan's meteorological agency issued tsunami warnings and advisories for a stretch of coast 420km long, from Aomori prefecture in the north to Ibaraki prefecture in central Japan, just north of Tokyo. Hundreds of aftershocks have shaken north-eastern Japan in the wake of the earlier earthquake, but few have measured higher than 7.0. About 28,000 people are dead or missing, and hundreds of thousands were left homeless after the tsunami which ripped through north-eastern Japan.
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