Another strong earthquake has struck off the coast of Japan. A tsunami alert was issued for the country's northeast coast, still reeling from the impact of last month's quake and tsunami. The latest quake was measured at 7.4. The tsunami warning was lifted 90 minutes later.
Officials at Japan's damaged nuclear power plant say there are no signs of new damage there from a strong aftershock today.
Announcers on Japan's public broadcaster NHK told coastal residents to run to higher ground.
Last month's quake and tsunami are believed to have killed some 25,000 people. The disaster sparked an ongoing crisis at a nuclear power plant.
But officials at the plant say they aren't seeing any additional problems. They say they evacuated two workers there and seven at a sister plant to the south.
Officials say today's aftershock hit 16 miles under the water.
An earthquake monitor in Colorado says it happened at about the same location and depth as last month's quake, which was a 9.0-magnitude.
Buildings as far away as Tokyo shook today for about a minute.
U.S. officials say a 7.4-magnitude earthquake off the coast of Japan is not expected to create a tsunami threat in Hawaii or the West Coast.
Federal agencies say that area includes Hawaii, California, Oregon, Washington, Alaska and British Columbia, Canada.
No tsunami warning, watch or advisory is in effect for these areas.
The Japan meteorological agency issued a tsunami warning for a wave of up to about 3 feet. The warning was issued for a coastal area of Japan already torn apart by last month's tsunami.