A series of powerful earthquakes that hit western Japan have left at least 55 people dead and damaged thousands of buildings, vehicles and boats. Officials warned Tuesday that more quakes could lie ahead.

Aftershocks continued to shake Ishikawa prefecture and nearby areas a day after a magnitude 7.6 temblor slammed the area.

Damage was so great that it could not immediately be assessed. Japanese media reports said tens of thousands of homes were destroyed.

Government spokesperson Yoshimasa Hayashi said 17 people were seriously injured and gave a slightly lower death toll, saying he was aware of the prefecture’s tally.