Aftershocks have rattled Japan a day after a powerful magnitude 6.5 earthquake left at least one person dead and damaged buildings, emergency services said, as officials assessed the damage from the quake that injured more than 20 people and shut high-speed train lines.

Japan’s Kyodo News agency reported that a 65-year-old man died when he fell from a ladder during the earthquake that hit the central Ishikawa region mid-afternoon on Friday at a depth of 12 km (7 miles).

Approximately 55 aftershocks, some of them strong, hit on Saturday morning, the country’s disaster management agency said, as it warned that heavy rain could trigger landslides in affected areas.