A woman holds her dog as they are scanned for radiation at a temporary scanning center for residents living close to the quake-damaged Fukushima Dai-ichi nuclear power plant Wednesday, March 16, 2011, in Koriyama, Fukushima Prefecture, Japan. (AP Photo/Gregory Bull)
(AP Photo/Gregory Bull)
A tsunami survivor, left, looking for belongings from where her house was standing walks by U.S. rescue team members with a sniff dog working in debris in Ofunato in Iwate Prefecture (state), northeastern Japan, Tuesday, March 15, 2011, four days after a massive earthquake and tsunami slammed northeastern Japan. (AP Photo/Yomiuri Shimbun, Masamichi Genkoh) (AP Photo/Yomiuri Shimbun, Masamichi Genkoh)
A ferry stranded on a building is seen in Otsuchi, Iwate Prefecture, northern Japan, Sunday, March 13, 2011, two days after a powerful earthquake-triggered tsunami hit the country's east coast. (AP Photo/The Yomiuri Shimbun) (AP Photo/The Yomiuri Shimbun)
A child is held by a woman in a disaster sheet at a temporary shelter set up at Aoyama Gakuin University in Tokyo Friday, March 11, 2011. A powerful tsunami spawned by the largest earthquake in Japan's recorded history slammed the eastern coast Friday, sweeping away boats, cars, homes and people as widespread fires burned out of control. (AP Photo/The Yomiuri Shimbun, Reiri Kurihara) (AP Photo/The Yomiuri Shimbun, Reiri Kurihara)
Fishing boats are damaged in Asahi, Chiba prefecture (state), Japan, after a ferocious tsunami unleashed by Japan's biggest recorded earthquake slammed into its eastern coast Friday, Friday, March 11, 2011. (AP Photo/The Yomiuri Shimbun)
Hotel employees squat down in horror at the hotel's entrance in Tokyo after a strong earthquake hit Japan Friday, March 11, 2011. (AP Photo/Itsuo Inouye)
(AP Photo/Itsuo Inouye)
Travelers rest on the floor stranded at the Haneda international airport in Tokyo after a massive earthquake Friday, March 11, 2011. The ferocious tsunami spawned by one of the largest earthquakes ever recorded slammed Japan's eastern coasts. (AP Photo/Wally Santana)
(AP Photo/Wally Santana)
Police officers wearing gas masks patrol in the area of the Fukushima power plant's Unit 1 in Okumamachi, Fukushima Prefecture (state), northern Japan, Saturday, March 12, 2011, amid fears that a part of the plant could meltdown after being hit by a powerful earthquake and tsunami Friday. (AP Photo/The Yomiuri Shimbun, Kaname Yoneyama) (AP Photo/The Yomiuri Shimbun, Kaname Yoneyama)
Travelers rest on the floor stranded at the Haneda international airport in Tokyo after a massive earthquake Friday, March 11, 2011. The ferocious tsunami spawned by one of the largest earthquakes ever recorded slammed Japan's eastern coasts. (AP Photo/Wally Santana)
(AP Photo/Wally Santana)
Patients and nurses evacuated from a hospital stay outside the building in Sendai, Miyagi Prefecture, Friday, March 11, 2011 after a powerful tsunami spawned by the largest earthquake in Japan's recorded history slammed the eastern coast. (AP Photo/The Yomiuri Shimbun, Miho Ikeya)
Commuters wait in a long queue at a bus terminal outside Yokohama railway station in Yokohama, southwest of Tokyo, following a strong earthquake hit eastern Japan on Friday, March 11, 2011. (AP Photo/Shuji Kajiyama)
This image provided by the Pacific Tsunami Warning Center shows a "tsunami forecast model" created by the Pacific Tsunami Warning Center in Ewa Beach, Hawaii predicting the wave height of the tsunami generated by the Japan earthquake Friday March 11, 2011. The Hawaii's islands are located at the edge of the yellow pattern, but waves could be higher along the coastline when the tsunami arrives. (AP Photo/Nathan Becker - Pacific Tsunami Warning Center) (AP Photo/Nathan Becker)
Houses, cars and other debris are washed away by tsunami tidal waves in Kesennuma in Miyagi Prefecture, northern Japan, after strong earthquakes hit the area Friday, March 11, 2011. (AP Photo/Keichi Nakane, The Yomiuri Shimbun)
Black smoke rises from a building in Tokyo's Odaiba bay area after strong earthquakes hit Japan Friday, March 11, 2011. (AP Photo/Yasushi Kanno, The Yomiuri Shimbun)
People evacuated to a rooftop of a building look at other buildings damaged by tsunami tidal waves at a port in Kesennuma in Miyagi Prefecture, northern Japan, after strong earthquakes hit the area Friday, March 11, 2011. (AP Photo/Keichi Nakane, The Yomiuri Shimbun)
TV footage shows cars being washed away after a tsunami hits following the massive earthquake in Japan on Friday. (Photos courtesy NHK World)
TV footage shows cars being washed away after a tsunami hits following the massive earthquake in Japan on Friday. (Photos courtesy NHK World)
Aerial footage in Japan shows a tsunami wave washing away everything in its path following a huge earthquake. (Photos courtesy NHK World)
People watch the aftermath of tsunami tidal waves covering a port at Kesennuma in Miyagi Prefecture, northern Japan, after strong earthquakes hit the area Friday, March 11, 2011. (AP Photo/Keichi Nakane, The Yomiuri Shimbun) (AP Photo/Keichi Nakane, The Yomiuri Shimbun)
Office workers in Tokyo's Shiodome district near Tokyo Bay stay on the pedestrian deck Friday, March 11, 2011, shortly after a 7.9-magnitude earthquake has struck off Japan's northeastern coast. (AP Photo/Koji Sasahara) (AP Photo/Koji Sasahara)
Hotel employees gather at the hotel's entrance in Tokyo, Japan as an earthquake hits Friday, March 11, 2011. Japan was struck by a magnitude-8.8 earthquake off its northeastern coast Friday, triggering a 13-foot (4-meter) tsunami that washed away cars and tore away buildings along the coast near the epicenter. (AP Photo/Itsuo Inouye) (AP Photo/Itsuo Inouye)
Office workers in Tokyo's Shiodome district near Tokyo Bay stay on the pedestrian deck, observing surrounding high-rise office and hotel buildings swaying Friday, March 11, 2011, shortly after a 7.9-magnitude earthquake has struck off Japan's northeastern coast. (AP Photo/Koji Sasahara) (AP Photo/Koji Sasahara)
Yurikamome train passengers walk on the elevated track towards Shiodome Station in Tokyo's Shiodome district near Tokyo Bay Friday, March 11, 2011, shortly after a 7.9-magnitude earthquake has struck off Japan's northeastern coast. (AP Photo/Koji Sasahara) (AP Photo/Koji Sasahara)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
The tsunami rammed directly into a breakwater in Kesennuma city in Miyagi prefecture, according to footage on public broadcaster NHK. (Photo courtesy NHK World) (Photo courtesy NHK World)
Hotel guests from the Moana Surfrider evacuate early Friday, March 11, 2011 in Honolulu. The state of Hawaii is under a tsunami warning due to a large 8.9 earthquake which struck off Japan. The earthquake is believed to have generated a tsunami wave. The Pacific Tsunami Center expects the wave to hit Oahu at 3:21 a.m. Hawaiian Standard Time. (AP Photo/Eugene Tanner) (AP Photo/Eugene Tanner)