A 6.7 magnitude earthquake was registered at 18:08 GMT Wednesday some 67 kilometers (42 miles) from the city of Sapporo on the island of Hokkaido. It was earlier reported that the earthquake had killed 13 people,.
The earthquake also triggered a large-scale blackout on the island, leaving 2.95 million homes without electricity. By Friday morning, electricity supply had been restored to 964,000 households, complete restoration will take about a week.
The new Chitose airport is still closed, with all Friday flights cancelled.