7.3 magnitude earthquake in Japan, tsunami alert : Power cuts to more than two million homes

A powerful 7.3-magnitude quake jolted eastern Japan on Wednesday night, rattling the capital Tokyo and prompting a tsunami threats for parts of the northeast coast.

The quake, which cut power to more than two million households, was centred off the coast of the Fukushima region at a depth of 60 kilometres (37 miles), reports AFP quoting Tokyo Electric Power Company.

Japan's nuclear authority said no abnormalities were detected at the stricken Fukushima plant that went into meltdown in 2011 when a huge 9.0-magnitude quake hit off the eastern coast, triggering a deadly tsunami and nuclear disaster.