The Japan Meteorological Agency said the quake was centered about 60 kilometers (37 miles) beneath the ocean bed.
Tremors were also felt in Tokyo, to the southwest.
Tokyo Electric Power Co. said there were no irregularities at the Fukushima Dai-ichi nuclear plant, which experienced meltdowns following a massive quake and tsunami 10 years ago.
Kato said the plant was being inspected but there was "no concern of a damage-causing tsunami" and "no anomalies" had been reported at the site.
In Minami Soma, one of the Fukushima villages evacuated after the nuclear disaster in 2011, NHK, the public broadcaster, reported that severe horizontal shaking lasted for about 30 seconds.
There were no immediate reports of significant damage, though local news broadcast images of a landslide on a highway.
Chief Cabinet Secretary Katsunobu Kato addressed reporters after midnight and said evaluations were under way.
There have been no reported casualties, officials said, but nearly one million homes in the region are without power.
Aerial footage broadcast by NHK showed a hillside that collapsed onto a highway in Fukushima region, severing the road.
Almost 10 years ago on March 11, 2011, three nuclear reactors in Fukushima melted down after a quake and tsunami in the area, killing more than 18,000 people. Experts are warning of aftershocks over the next several days, including possibly larger quakes.
Some people were taking shelter at evacuation centres, and were being warned to practice social distancing because of the coronavirus pandemic.
Japan is one of the world's most seismically active areas, and it accounts for roughly 20 per cent of the world's earthquakes that are magnitude 6 or greater.
Local media reported the quake threw dishes from shelves in houses in the region, but there were no immediate reports of damage. But residents of Tokyo said this was the strongest quake they had experienced in years, possibly even since the 2011 quake.
He said the two different versions of adenovirus led to higher immune response against the coronavirus . At least three more Russian coronavirus vaccines are expected to be rolled out in the coming weeks.
He was scheduled to appear in one more episode later this season, but the network has made a decision to eliminate his character. While the agency made no public comments, Deadline recently confirmed he is no longer a client of the famous agency.
The winds were forecast to return to highs of 75km per hour later on Wednesday , potentially driving the blaze to new areas. Strong winds caused it to spread rapidly and made it "near impossible" for firefighters to control, an official said.
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Ollie Watkins grabbed a late consolation but Dean Smith's side often struggled to handle the organised and vibrant Hammers. Tyrone Mings' acrobatic clearance stopped Antonio making it 3-0 and Watkins pulled a goal back with nine minutes left.
The National Weather Service in Huntsville said a slight chance of freezing rain will arrive tonight for northwest Alabama. Some brief travel problems will be possible before the precipitation changes over to all rain later Saturday morning.
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South Africa were behind the required run rate at the time of the stoppage, and therefore Pakistan won. South Africa must improve their batting show after suffering twin collapses across the two innings.
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Opener Paul Stirling too hit Sompal Kami for two consecutive boundaries of the first two balls of the second over. Rayad Emrit ended Wright's quick knock by forcing him to hit straight to Fabian Allen at mid-wicket for 33.
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Appealing for unity from Italy's squabbling political forces, he added: "We have the chance to do a lot for our country". The block had insisted on Mr Conte remaining premier and bitterly resented Mr Renzi's power play that brought him down.