Smoke rises in the distance behind destroyed houses in Kesennuma City in Miyagi Prefecture in northeastern Japan March 12, 2011. (REUTERS/Kyodo) #

A car sits on top of a small building in a destroyed neighborhood in Sendai, Japan, on Sunday, March 13, 2011 after it was washed into the area by the tsunami that hit northeastern Japan. (AP Photo/David Guttenfelder) #

People are rescued by helicopter from a rooftop following an earthquake and tsunami in Sendai, northeastern Japan March 12, 2011. (REUTERS/Kyodo) #

A victim's hand sticks out among the rubble after a magnitude 9.0 earthquake and tsunami struck Rikuzentakata, northern Japan March 13, 2011. (REUTERS/Toru Hanai) #

Cargo containers strewn about by the recent tsunami in Sendai, northern Japan, Saturday, March 12, 2011. (AP Photo/Itsuo Inouye) #

Smoke billows from an oil refinery with submerged rice paddy in foreground following a massive tsunami triggered by a powerful earthquake in Sendai, Miyagi prefecture, northern Japan, Saturday, March 12, 2011. (AP Photo/Junji Kurokawa) #

Cars, which were swept together by a tsunami then caught fire, are seen after an earthquake in Hitachi City, Ibaraki Prefecture March 12, 2011. (REUTERS/Yomiuri) #

A damaged train off its tracks after an earthquake and tsunami in Matsushima City, Miyagi Prefecture March 12, 2011. (REUTERS/Yomiuri) #

Fire boats battle a blaze at the Cosmo Oil facility in Ichihara City, Chiba Prefecture near Tokyo March 12, 2011. (REUTERS/Kyodo) #

A man looks at messages left by survivors at an evacuation center in Ofunato, Iwate Prefecture in northeastern Japan March 12, 2011. (REUTERS/Kyodo) #

A survivor cries at a shelter in Rikuzentakata, Iwate prefecture in northeast Japan March 13, 2011 after the magnitude 9.0 earthquake and tsunami struck the area. (REUTERS/Lee Jae-Won) #

A vehicle is half-submerged at a crossroad after an earthquake and tsunami in Sendai, northeastern Japan March 12, 2011. (REUTERS/Jo Yong-Hak) #

A firefighter runs at the site of a massive tsunami, triggered by a powerful earthquake in Sendai, Miyagi prefecture, northern Japan, Saturday, March 12, 2011. (AP Photo/Junji Kurokawa) #

People in a floating container are rescued from a building following an earthquake and tsunami in Miyagi Prefecture, northeastern Japan March 12, 2011. (REUTERS/Kyodo) #

Factory facilities look damaged in an industrial complex in Sendai, northern Japan, Saturday, March 12, 2011. (AP Photo/Itsuo Inouye) #

Vessels lie in the rubble in Ofunato, Iwate prefecture, northern Japan, Saturday, March 12, 2011, after being washed away by an earthquake-triggered tsunami. (AP Photo/The Yomiuri Shimbum, Miho Iketani) #

Oil leaked from a Nippon Petroleum Refining Co. oil factory float at Shiogama bay, Miyagi prefecture, Japan, Saturday, March 12, 2011, a day after one of Japan's strongest earthquakes ever recorded hit the country's east coast. (AP Photo/The Yomiuri Shimbun, Naoki Ueda) #

Police officers wearing respirators guide people to evacuate away from the Fukushima Daiichi nuclear plant following an evacuation order for residents who live in within a 10 km (6.3 miles) radius from the plant after an explosion in Tomioka Town in Fukushima Prefecture March 12, 2011. Japanese authorities battling to contain rising pressure in nuclear reactors damaged by a massive earthquake were forced to release radioactive steam from one plant on March 12, 2011 after evacuating tens of thousands of residents from the area. Tokyo Electric Power Co also said fuel may have been damaged by falling water levels at the Daiichi facility, one of its two nuclear power plants in Fukushima, some 240 km (150 miles) north of Tokyo. (REUTERS/Asahi Shimbun) #

A patient is evacuated from a destroyed hospital after a magnitude 8.9 earthquake and tsunami hit Otsuchi Town, Iwate Prefecture in northern Japan March 13, 2011. (REUTERS/Kyodo) #

Self-Defense Force officers search for missing people after a tsunami and earthquake in Rikuzentakatashi City in Iwate Prefecture in northeastern Japan March 12, 2011. (REUTERS/Yomiuri) #

Buildings destroyed by a tsunami are pictured in Minamisanriku, Miyagi Prefecture, in northern Japan after the magnitude 8.9 earthquake and tsunami struck the area, March 13, 2011. (REUTERS/Kyodo) #

Evacuees sit through an earthquake at a temporary shelter at a stadium in Koriyama, northeastern Japan March 12, 2011. (REUTERS/Jo Yong-Hak) #

Damaged houses are seen after an earthquake and tsunami in Sendai, northeastern Japan March 12, 2011. (REUTERS/Jo Yong-Hak) #

White smokes rises into the air in the badly damaged town of Yamada in Iwate prefecture on March 12, 2011 a day after a massive quake and tsunami hit the region. (YOMIURI SHIMBUN/AFP/Getty Images) #

A resident is rescued from debris in Natori, Miyagi, northern Japan Saturday, March 12, 2011, after one of the country's strongest earthquakes ever recorded hit its eastern coast on Friday. (AP Photo/Asahi Shimbun, Noboru Tomura) #

A ship sits grounded after a tsunami and earthquake in Kamaishi City in Iwate Prefecture March 12, 2011. (REUTERS/YOMIURI) #

Buildings stand in the rubble in Rikuzentakata, northern Japan after the magnitude 9.0 earthquake and tsunami struck the area, March 13, 2011. (REUTERS/Toru Hanai) #

Rescue workers lift the body of a victim from the rubble in Rikuzentakata, northern Japan after the magnitude 8.9 earthquake and tsunami struck the area, March 13, 2011. (REUTERS/Toru Hanai) #

Building foundations and mud are all that remain in a tsunami-devastated area in Sendai, northeastern Japan March 12, 2011. (REUTERS/Jo Yong-Hak) #

People evacuate with small boats down a road flooded by the tsunami waves in the city of Ishinomaki in Miyagi prefecture on March 12, 2011 a day after massive quake and tsunami hit the region. (JIJI PRESS/AFP/Getty Images) #

A man looks at the scene of devastation as he stands in the rubble in Rikuzentakata, northern Japan after the magnitude 9.0 earthquake and tsunami struck the area, March 13, 2011. (REUTERS/Toru Hanai) #

A person walks past an overturned squid-fishing boat tossed onto land by a tsunami in Hachinohe City, Aomori Prefecture, in northern Japan, March 13, 2011. (REUTERS/Kyodo) #