The USGS put the epicenter of the shallow shake around 160 kilometers (100 miles) from the town of Makurazaki in southwest Japan, however no real harm was at first reported.
Tidal waves measuring one meter (three feet) in stature were seen on a few islands, open telecaster NHK reported, refering to nearby powers, who were asking individuals in low lying zones to move away to higher ground for security.
Powers said bigger torrents were still conceivable and asked alert over an hour after the seismic tremor.
The Pacific Tsunami Warning Center had before said that there was no torrent danger from the shudder, which struck at 5:51 am (2051 GMT Friday).
Japan's islands are arranged at the crossroads of a few tectonic plates and experience various moderately fierce tremors each year.
In any case, construction laws are thorough and general fiasco drills are held, guaranteeing that in spite of their recurrence and extent, tremors typically go without death toll or noteworthy harm to property in Japan.
A huge undersea shudder that hit in March 2011 sent a torrent barrelling into Japan's upper east drift.
And murdering a great many individuals and crushing groups, the waves likewise overwhelmed the cooling frameworks at the Fukushima atomic plant, sending three reactors into emergency.
The atomic fiasco, the world's most exceedingly terrible since Chernobyl, uprooted a huge number of individuals and rendered tracts of area appalling, potentially for a considerable length of time.
