Saturday's natural disaster, with a magnitude of 7.1, had an epicenter off the coast at a depth of 60 kilometers (30 miles) the Japan Meteorological Agency said, adding there was no risk of a tsunami.
"We have received reports that Onagawa nuclear plant and Fukushima Daichi nuclear plant are not showing any abnormality", he added.
There were no reports of irregularities at the Tokaimura nuclear facility, public broadcaster NHK said.
No tsunami warning had been issued, the meteorological agency said.
Tokyo Electric Power Co. said that some 860,000 homes were without power as a result of the quake, but electricity was gradually being restored, according to Kato.
File folders and other items are seen scattered on the floor of the Hirono town office in Fukushima Prefecture, northeastern Japan, on February 13, 2021.
Aerial footage broadcast by NHK showed a hillside that collapsed onto a highway in Fukushima region, severing the road.
It said the quake was considered an aftershock of the massive 2011 temblor.
Fortunately, the quake has not caused any deaths or serious material damage thus far.
Despite the relatively large size of the latest quake with the focus off Fukushima Prefecture, it was unlikely to cause tsunami because it had a deep epicenter of about 55 kilometers below the sea surface, Satake said.
Prime Minister Yoshihide Suga headed into his office immediately after reports of the quake, and a crisis center was set up there.
Chief Cabinet Secretary Katsunobu Kato addressed reporters after midnight and said evaluations were under way.