An earthquake with an initial magnitude reading of 5.5 hit eastern Japan, including the Tokyo area, on Sunday morning, news sources reported.

There were no immediate reports of damage or abnormalities at the wrecked Fukushima nuclear power plant, Reuters reported.

A tsunami alert was not issued, Japan Today reported. 

The Japan Meteorological Agency reported the earthquake's epicenter was 70 kilometers deep in the southern Ibaraki Prefecture, just northeast of Tokyo, Japan Today reported.

Fukushima operator Tokyo Electric Power Co. said the quake had no apparent effect on the plant, which lies 220 km northeast of Tokyo, Reuters reported. 

"We have so far seen no abnormalities in monitoring post figures around the plants or in other parameters," a Tokyo Electric spokesman said, Reuters reported.

Public broadcaster NHK said two bullet trains linking Tokyo with northern Japan were suspended for a short time, while its two international airports carried on normally and there was no evidence of abnormalities at the Tokai Daini nuclear facility, Reuters reported.