A total of 150 people were injured after an earthquake with a magnitude of 7.3 struck off Japan's Fukushima Prefecture at 11:08 p.m. local time (1408 GMT) on Saturday, according to local authorities.

The epicenter of the earthquake was at a depth of 60 kilometers, the Japan Meteorological Agency said, adding that no tsunami warning had been issued.

Most of the injured resided in Fukushima and Miyagi prefectures, and traffic was suspended in the affected areas. The quake triggered a landslide in Fukushima. 

The quake was believed to be an aftershock of the devastating quake 10 years ago that triggered a massive tsunami in the area and caused core meltdowns at the Fukushima Daiichi nuclear power plant, according to the agency.

Water in a spent nuclear fuel pool spilled over at the Fukushima Daiichi power plant, but there was no leak, operator Tokyo Electric Power Company Holdings Inc. said.

No irregularities were reported at other nuclear plants and there was no change in the radiation levels around these plants, according to the company.

Since late Saturday, a series of aftershocks have been occurring. Up to 950,000 households were left without electricity at one point, but power had been restored by Sunday afternoon, reported Kyodo News Agency. 

There were also no reported deaths of Chinese nationals in the quake, said the Chinese Consulate-General in Niigata.