There were reports of at least 20 people being injured in Miyagi and Fukushima prefectures, according to local authorities.
Fire department officials in northeastern Japan say at least 80 people have been injured in Miyagi and Fukushima prefectures due to an quake that occurred late Saturday.
Japan Meteorological Agency said there was no initial information that a tsunami was imminent.
According to public broadcaster NHK, 104 people were injured, majority spraining their ankles while falling on stairs or getting cut by broken glass.
"Even if people say we don't need to worry about a tsunami, I won't buy it", said a 50-year-old male worker.
More than 100 people were injured and trains halted over a wide swathe of northeastern Japan on Sunday (Feb 14) after the region was jolted by a major natural disaster in the same area as the 2001 Fukushima quake that set off a tsunami almost 10 years ago.
Speaking to reporters early on Sunday morning, Suga said the damage is still being assessed, and asked residents in the affected area to stay indoors and be prepared for aftershocks.
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Japan's meteorological agency said the quake hit at 11.08pm (1408GMT) at a depth of 60 kilometres (37 miles) in the Pacific, off Fukushima - near the epicentre of a 2011 killer quake which triggered a towering tsunami and killed more than 18,000.
The tremor was also felt in the capital of Tokyo.
Kato said there was no danger of a tsunamzi from the quake.
It said crews did not detect radiation leaks or other abnormalities at the destroyed Fukushima Daiichi nuclear plant.
A total of 64 evacuation centers have been set up in Fukushima and about 200 people are taking shelter, according to the Fukushima Prefectural Government. The blackouts appeared to be concentrated in northeast Japan, including Fukushima and neighboring prefectures. The Japan Atomic Power Co.'s inactive Tokai No. 2 nuclear power plant also remain unscathed.
The US Geological Survey registered the quake at a revised magnitude of 7.1 with a depth of 51 kilometers. NHK aerial footage showed a portion of a highway blocked by a landslide in Soma, a city in Fukushima prefecture.