Japan Suffers Another Quake

BBC News reports:

A powerful earthquake has hit north-east Japan, exactly a month after the devastating earthquake and tsunami.

The 7.1-magnitude tremor triggered a tsunami warning, and forced the evacuation of workers from the crippled Fukushima nuclear plant.

The epicentre of the quake was in Fukushima prefecture, and struck at a depth of just 10km (six miles).

It came as Japan said it was extending the evacuation zone around the nuclear plant because of radiation concerns.

The cooling systems at the Fukushima Daiichi nuclear plant were damaged in last month's disaster. Workers have been struggling to prevent several reactors from overheating, and avert a large-scale release of radiation.

The enlarged zone will encompass five communities beyond the existing 20-km (12-mile) radius, where high radiation levels have been detected.

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