A magnitude-7.3 earthquake struck off the coast of Japan Friday afternoon near the heavily-damaged Fukushima nuclear site.
The earthquake hit at a depth of about 6 miles in the Pacific Ocean, just east of Japan's east coast at 2:10 a.m. Saturday Tokyo time.
The USGS says that the epicenter is about 202 miles away from the city of Ishinomaki and about 300 miles away from Tokyo.
There is no word on the extent of any damage or injuries.
Japan's Meteorological Agency raised the tsunami warning for the area of Honshu. But the U.S. Pacific Tsunami Warning Center did not post warnings for the rest of the Pacific.
Japanese broadcaster NHK reported that Tokyo Electric Power Co., the operator of the Fukushima plant, ordered workers near the coast to move to higher ground. Japanese news service Kyodo said there were no signs of trouble at the plant.
All but two of Japan's 50 reactors have been offline since the March 2011 magnitude-9.0 earthquake and ensuing tsunami triggered multiple meltdowns and massive radiation leaks at the Fukushima Dai-ichi nuclear power plant, about 160 miles northeast of Tokyo.
About 19,000 people were killed.
The Associated Press contributed to this story.