However, no tsunami warning was issued
An earthquake with a preliminary magnitude of 6.3 hit off the coast of southern Japan on Friday, the Japan Meteorological Agency has said.
But no tsunami warning was issued and there were no immediate reports of damage.
The quake struck at 8:48am local time (2348 GMT Thursday), with its epicenter off the coast of Miyazaki prefecture at a depth of 20km (12 miles), the agency said.
The US Geological Survey (USGS) put the magnitude of the quake at 6.4.