The death toll has risen to 16 after the magnitude 6.6 earthquake struck Hokkaido.
Dozens are still missing after the quake triggered landslides at the tourist hotspot.
More than 22,000 search and rescue personnel are still looking for 26 people missing in the western town of Atsuma in Hokkaido Prefecture, Prime Minister Shinzo Abe said.
More than 150 people were injured by the quake, most in the capital city of Sapporo.
The landslides buried houses and brought Hokkaido to a standstill with widespread power and transport cuts.
The island’s fossil-fuel power plant, Hokkaido Electric Power Co, shut down as a precaution after the quake.
By early Friday, much of the island had its power restored but it reported it could take at least a week to restore power fully.
The powerful quake, which struck in the early hours of the morning, lasted about a minute, jolting residents from their beds.
Dramatic photographs show the landslides which wiped out the tiny town of Atsuma, near the epicentre.
Photos from Sapporo showed huge cracks in the street and subsided houses.
Helicopter rescue crews were dispatched and have airlifted about a dozen people to safety.
Evacuation shelters have been set up around the region.
The Japan Meteorological Agency said aftershocks continued throughout Thursday and could remain a risk for the next week.
There is the additional risk that weekend buildings could still collapse, further shaken by the tremors.
The quake was the second disaster to hit Japan this week alone after Typhoon Jebi ripped through Osaka on Tuesday.
Jedi has been called the worst typhoon to hit the country in 25 years, stranding thousands of tourists as Kansai international airport shut on Tuesday.
All flights have been cancelled and there is no confirmation of when the airport will reopen.
At least 10 people were killed when Jebi stormed across Japan, and another 160 were injured.
Infrastructure was destroyed, bridges ripped to shreds and airfields completely flooded.
Rescue crews continue working around the clock to restore services after Jebi knocked cut power lines.
The storm recorded winds of up to 135 mph (216 km/h), the equivalent to a major Category 4 hurricane in the Atlantic.