A powerful aftershock hit earthquake-ravaged Japan on Thursday, which triggered a tsunami warning along the northeast coast. Fortunately, thus far, no tsunami has hit land.
The 7.4 aftershock was centered in the same location and same depth in the ocean as the disastrous quake that rocked Japan a month ago. Japan's meteorological agency issued a tsunami warning for a wave of up to 6 feet high for the coastal areas already devastated by last month's tsunami, which killed an estimated 25,000 people.
Japanese broadcaster NHK urged residents of Miyagi prefecture to get away from the coast and move to higher ground.
Officials at the crippled Fukushima Daiichi nuclear plant said the latest quake did not cause any new problems. Workers were evacuated from the plant, however.
The earthquake, which hit at 11:30 p.mm local time (10:30 a.m. eastern time), was felt as far as Tokyo, 200 miles away.
The earthquake is not expected to pose a tsunami threat to the United States. No tsunami warnings are in effect for Hawaii or the Pacific coast.