The region is home to the Fukushima Daiichi nuclear power plant, which went into meltdown after a tsunami in 2011.
The 2011 event is an event that still weighs on Japan and has left much of the surrounding region abandoned to this day.
A tsunami warning issued after the late Wednesday earthquake was lifted early Thursday and Fukushima power plant operator TEPCO reported “no abnormalities” at the site.
Power providers said supply was restored after outages in millions of households.
The quake was initially categorised as 7.3 magnitude, but was revised on Thursday to 7.4 magnitude.