By Marcus Leach

Japan has been hit with a second earthquake, measuring 7.1 on the Richter Scale, and authorities have subsequently issued a tsunami warning.

There has been no immediate impact on the Fukushima Daiichi nuclear plant damaged in last month's earthquake and tsunami, nor at two other nuclear plants in the area, officials say.

Authorities have ordered an evacuation from the warning zone, after the latest quake struck off the east coast of Honshu. Fukushima workers were also evacuated after the tsunami was predicted to have a wave 2m (6ft) high.