07 April 2011 17:01 [Source: ICIS news]
The quake was initially measured at 7.4 magnitude but this was later revised down by the US Geological Survey (USGS).
The earthquake struck 66km (41 miles) east of Sendai, according to the USGS, at a depth of 49km.
Media reports have said that the Fukushima Daiichi nuclear plant, which was severely damaged in last month's earthquake and tsunami, has not been affected. However, workers had been evacuated from the plant without reports of any injuries, according to reports.
The extent of any damage or casualties from the quake, which struck at 23:32 local time (14:32GMT), is not yet known.
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