TOKYO, Sept. 4 (Xinhua) -- An earthquake measuring 6.9 on the Richter scale hit east off Japan at 9:19 a.m. local time Wednesday, with strong tremor felt in Tokyo.

The epicenter was initially detected at 29.8 degrees north latitude and 139.0 degrees east longitude near Chiba prefecture, with a depth of 400 km, according to the Japan Meteorological Agency.

No tsunami warnings have been issued by the agency and nor immediate injuries and damage reported.

Meanwhile, the China Earthquake Networks Center put the magnitude of the quake at 6.7 and the U.S. Geological Survey put it at 6.5.