A 5.5-magnitude earthquake has struck off the east coast of Japan, the US Geological Survey says no tsunami warning has been issued.
The quake hit at a depth of 26km at 3:13am (0713 NZT) this morning, about 324km east of the town of Namie, the USGS said.
The Pacific Tsunami Warning Centre did not issue an alert.
A powerful 7.1-magnitude undersea quake off the east coast two days ago triggered a small tsunami, which was recorded as being as high as 55cm in one place.
Workers were evacuated from the crippled Fukushima nuclear plant on Saturday but there were no reports of any damage. Japan's meteorological agency says the quake was an aftershock of the disastrous March 2011 tremor.
