The Japan Meteorological Agency said the quake struck 60 kilometers below sea level. The tremors were also felt in Tokyo, some 270 kilometers away, where they caused temporary power outages in two million households. Japanese television NHK also reported damaged buildings and fires in the city of Fukushima.

Tokyo Electric Power Company (Tepco) said about 2 million households were left without electricity.

As a result of the earthquake, a high-speed Shinkansen train derailed between Fukushima and the city of Shiroishi, and none of the hundreds of people on board were injured, Kyodo news agency reported. NHK television also reported fires and damage to buildings in the city of Fukushima.

The quake, with an epicenter at sea, had a magnitude of 7.3 and struck the same area where the massive earthquake and tsunami in March 2011 destroyed several hundred kilometers of coastline and killed 18,000 people. The accident at the Fukushima nuclear power plant also caused a tsunami several meters high. The tremor at the time was a magnitude nine and was the strongest earthquake recorded in the country’s history.

On Wednesday, local authorities issued aftershocks warnings for the prefectures of Fukushima, Miyagi and Yamagata. A tsunami warning of up to one meter in effect for the Fukushima and Miyagi regions.

Kyodo news agency said no abnormalities were detected at the Fukushima nuclear power plant, which has been inactive since the 2011 crash, following today’s earthquake.