A big quake off northern Japan left at least 30 injured, authorities said Tuesday, damaging roads and leaving thousands without power in freezing temperatures.

The Japan Meteorological Agency said the magnitude 7.5 quake at 11:15 pm on Monday (1415 GMT) -- downgraded from 7.6 initially -- raised the chances of similar or larger tremors in the coming days.

Prime Minister Sanae Takaichi said 30 people were injured in the quake off the coast of the Aamori region, which triggered tsunami waves up to 70 centimetres (28 inches) high.

The injured included one person seriously hurt in the main northern island of Hokkaido, according to the Fire and Disaster Management Agency.

Footage showed several crevasses in roads and at least one car in a hole, with broken glass from windows scattered on ro

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