TOKYO, July 12 (Xinhua) -- A 6.8 magnitude quake jolted off Fukushima prefecture in the northeast Japan at around 4: 22 a.m. local time early Saturday. The quake has triggered tsunami warnings along the pacific coast of Fukushima, Miyagi and Iwate prefectures.
The epicenter was initially detected at 37.0 degree of north latitude and 142.6 degree of east longitude, with a depth of 10 kilometers according to the Japan Meteorological Agency.
The quake was registered at level four on the Japan's seismic scale of 7 in some parts of Fukushima prefecture.
About one-meter-high tsunami is forecasted to reach the coasts at around 4:50 a.m., according to the agency.
There is no immediate report on damage and injuries as of now.
A disastrous quake jolted off Fukushima on March 11, 2011 and triggered devastating tsunami that killed more than 15,000 people and crippled the Fukushima Daiichi nuclear power plant.