Japan was assessing damage Tuesday and cautioning people of potential aftershocks after a late-night 7.5 magnitude earthquake caused injuries, light damage and a small tsunami in Pacific coastal communities.

The Fire and Disaster Management Agency said at least 33 people were injured, one seriously. Most of them were hit by falling objects, public broadcaster NHK reported.

The 7.5 magnitude quake struck around 11:15 p.m. in the Pacific Ocean, around 80 kilometers (50 miles) off the coast of Aomori, the northernmost prefecture of Japan’s main Honshu island. The U.S. Geological Survey said it occurred 44 kilometers (27 miles) below the surface.

A tsunami of up to 70 centimeters (2 feet, 4 inches) was measured in Kuji port in Iwate prefecture, just south of Aomori, and waves up to 50 centimeters struck other communities in the region, the Japan Meteorological Agency said. NHK reported the waves damaged some oyster rafts.

The agency lifted all tsunami advisories by 6:30 a.m. Tuesday.

Power was mostly restored by Tuesday morning, according to the Tohoku Electric Power Co.