A 5.8-magnitude earthquake struck Japan's northern island of Hokkaido on Thursday night.
The quake occurred at 9:22 PM. The focus was in the central part of the island at a depth of 33 kilometers.
Five people reported minor injuries, and more than 70 households are without water.
About 120 people were stranded overnight at New Chitose Airport.
Mudslides occurred in the town of Atsuma, but no damage has been reported.
One expert warned people living on or near slopes and hillsides to evacuate as soil is already loose after a major earthquake last year.
Last September, a magnitude 6.7 quake in the area killed 41 people.
An official at Japan Meteorological Agency says Thursday's quake was an aftershock of last September's.
Officials are warning people in the area to stay on alert for more seismic activity.