Northeast coast, still ravaged by last month's natural disasters, briefly on alert after major aftershock; No tsunami damage reported
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Play CBS Video Video 7.4 quake hits Japan, tsunami warning issued A tsunami warning has been issued following a 7.4 magnitude earthquake that struck just off the Northeast coast of Japan.
(CBS/AP) TOKYO - Japan was rattled by a magnitude-7.1 aftershock Thursday night nearly a month after a devastating earthquake and tsunami flattened the northeastern coast.
The strongest aftershock since the day of the magnitude-9.0 megaquake was a fresh blow to victims of that March 11 quake and subsequent tsunami that killed some 25,000 people, tore apart hundreds of thousands of homes and has sparked an ongoing crisis at a nuclear power plant.
Damage and injuries from the aftershock were not immediately clear. The Japan meteorological agency briefly issued another tsunami warning Thursday night, but later canceled it.
Complete coverage: Disaster in Japan
Officials at the tsunami-ravaged Fukushima Dai-ichi nuclear plant said there was no immediate sign of new problems caused by the aftershock. Japan's nuclear safety agency says workers there have retreated to a quake-resistant shelter in the complex. No one there was injured.
However, at the Onawaga power plant in Miyagi prefecture, two to three power lines went down, leaving the facility reliant on one remaining power line to service the cooling operations, a company official said.
Officials say Thursday's aftershock hit 30 miles under the water and off the coast of Miyagi prefecture. The quake that preceded last month's tsunami was a 9.0-magnitude. It was originally reported to be a magnitude-7.4, but the U.S. Geological Survey in Golden, Colo., later downgraded the quake to 7.1.
Paul Caruso, a geophysicist at USGS, said it struck at about the same location and depth as last month's hug quake. It's the strongest of the more than 1,000 aftershocks that have been felt since, except for a 7.9 aftershock that day.
Buildings as far away as Tokyo shook for about a minute.
In Ichinoseki, inland from Japan's eastern coast, buildings shook violently, knocking items from shelves and toppling furniture, but there was no heavy damage to the buildings themselves. Immediately after the quake, all power was cut. The city went dark, but cars drove around normally and people assembled in the streets despite the late hour.
The quake struck at 11:32 p.m. local time.
Another USGS geophysicist, Don Blakeman, said it was the strongest aftershock since March 11, although several aftershocks on that day were bigger.
The USGS said the aftershock struck off the eastern coast 40 miles from Sendai and 70 miles from Fukushima. It was about 205 miles from Tokyo.
A Pacific Tsunami Warning Center evaluation of the quake said an oceanwide tsunami was not expected. However, it noted quakes of that strength can cause waves that are destructive locally.
The strongest aftershock since the day of the magnitude-9.0 megaquake was a fresh blow to victims of that March 11 quake and subsequent tsunami that killed some 25,000 people, tore apart hundreds of thousands of homes and has sparked an ongoing crisis at a nuclear power plant.
Damage and injuries from the aftershock were not immediately clear. The Japan meteorological agency briefly issued another tsunami warning Thursday night, but later canceled it.
Complete coverage: Disaster in Japan
Officials at the tsunami-ravaged Fukushima Dai-ichi nuclear plant said there was no immediate sign of new problems caused by the aftershock. Japan's nuclear safety agency says workers there have retreated to a quake-resistant shelter in the complex. No one there was injured.
However, at the Onawaga power plant in Miyagi prefecture, two to three power lines went down, leaving the facility reliant on one remaining power line to service the cooling operations, a company official said.
Officials say Thursday's aftershock hit 30 miles under the water and off the coast of Miyagi prefecture. The quake that preceded last month's tsunami was a 9.0-magnitude. It was originally reported to be a magnitude-7.4, but the U.S. Geological Survey in Golden, Colo., later downgraded the quake to 7.1.
Paul Caruso, a geophysicist at USGS, said it struck at about the same location and depth as last month's hug quake. It's the strongest of the more than 1,000 aftershocks that have been felt since, except for a 7.9 aftershock that day.
Buildings as far away as Tokyo shook for about a minute.
In Ichinoseki, inland from Japan's eastern coast, buildings shook violently, knocking items from shelves and toppling furniture, but there was no heavy damage to the buildings themselves. Immediately after the quake, all power was cut. The city went dark, but cars drove around normally and people assembled in the streets despite the late hour.
The quake struck at 11:32 p.m. local time.
Another USGS geophysicist, Don Blakeman, said it was the strongest aftershock since March 11, although several aftershocks on that day were bigger.
The USGS said the aftershock struck off the eastern coast 40 miles from Sendai and 70 miles from Fukushima. It was about 205 miles from Tokyo.
A Pacific Tsunami Warning Center evaluation of the quake said an oceanwide tsunami was not expected. However, it noted quakes of that strength can cause waves that are destructive locally.
© 2011 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.
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