UPDATE: The Japan Meteorological Agency says the quake struck around 6 a.m at a depth of 10 kilometers (6 miles). It warned people along the coast to move to higher ground.
The U.S. Geological Survey measured the magnitude at 6.9. The earthquake shook buildings in Tokyo, 240 kilometers (150 miles) southwest of the epicenter.
Fukushima prefecture is home to the nuclear power plant that was destroyed by a huge tsunami following an offshore earthquake in 2011.
The operator of the plant said there were no abnormalities observed at the plant, Japanese public broadcaster NHK said.
TOKYO (AP/KWQC) – Magnitude 7.3 earthquake strikes off Fukushima in Japan, tsunami warning issued.
We are still waiting for more information to come in, but it is the same area where a powerful quake shook the country for nearly six minutes on March 11, 2011.
More than 20-thousand people died or went missing that day. The quake also damaged the Fukushima nuclear reactor, knocking out the cooling system and causing a reactor fuel meltdown. Deadly radiation leaked into the sea and surrounding area.
It was the worst nuclear disaster since the Chernobyl incident in 1986.