Cars and airplanes swept by a tsunami are pictured among debris at Sendai Airport, northeastern Japan March 11, 2011.

A massive tsunami sweeps in to engulf a residential area after a powerful earthquake in Natori, Miyagi Prefecture in northeastern Japan March 11, 2011. The biggest earthquake to hit Japan in 140 years struck the northeast coast on Friday, triggering a 10-metre tsunami that swept away everything in its path, including houses, cars and farm buildings on fire. A tsunami warning has been issued for the entire Pacific basin except for the mainland United States and Canada following a huge earthquake that hit Japan on Friday, the Pacific Tsunami Warning Center said.

A massive tsunami hits the coastal areas of Iwanuma, Miyagi Prefecture, northeastern Japan March 11, 2011. A massive 8.9 magnitude quake hit northeast Japan on Friday, causing many injuries, fires and a ten-metre (33-ft) tsunami along parts of the country's coastline. A tsunami warning has been issued for the entire Pacific basin except for the mainland United States and Canada following a huge earthquake that hit Japan on Friday, the Pacific Tsunami Warning Center said.

Cars swept by a tsunami are seen after an earthquake in Hitachi City, Ibaraki Prefecture March 12, 2011. Japan confronted devastation along its northeastern coast on Saturday, with fires raging and parts of some cities under water after a massive earthquake and tsunami that likely killed at least 1,000 people.

A large number of cars swept by a tsunami following an earthquake are seen in Sendai, northeastern Japan March 12, 2011. Japan confronted devastation along its northeastern coast on Saturday, with fires raging and parts of some cities under water after a massive earthquake and tsunami that likely killed at least 1,000 people.

People, in a floating container, are rescued from a building following an earthquake and tsunami in Miyagi Prefecture, northeastern Japan March 12, 2011. Japan confronted devastation along its northeastern coast on Saturday, with fires raging and parts of some cities under water after a massive earthquake and tsunami that likely killed at least 1,000 people.

People wait to be rescued atop a building with the letters "SOS" after an earthquake in Kesennuma, Miyagi Prefecture March 12, 2011. Japan confronted devastation along its northeastern coast on Saturday, with fires raging and parts of some cities under water after a massive earthquake and tsunami that likely killed at least 1,000 people.

A woman who was trapped in her home is carried by a Japan Self Defense Force soldier in Kesennuma City in Miyagi Prefecture in northeastern Japan March 12, 2011. Japan confronted devastation along its northeastern coast on Saturday, with fires raging and parts of some cities under water after a massive earthquake and tsunami that likely killed at least 1,000 people.

Debris is pictured floating in the Pacific Ocean, in this photograph taken on March 13, 2011 and released on March 14. Ships and aircraft from the U.S. Navy's Ronald Reagan Carrier Strike Group are searching for survivors in the coastal waters near Sendai, Japan, in the wake of 8.9-magnitude earthquake and tsunami that officials say claimed at least 10,000 lives.

The wave from a tsunami crashes over a street in Miyako City, Iwate Prefecture in northeastern Japan after the magnitude 9.0 earthquake struck the area March 11, 2011. The ill-famous “March 11” earthquake that hit Japan was one of the worst disasters of 2011 that claimed over 15,000 lives. The massive 9.0 magnitude occurred near the east coast of Honshu, triggering a huge tsunami that washed away many coastal settlements. The March 11 earthquake and tsunami waves in Japan devastated Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi nuclear power plant in Fukushima prefecture, leading to leakage of radioactive water into the ocean, spread of radiation in air and soil. The Fukushima Daiichi nuclear disaster was dubbed as the worst nuclear accidents since 1986 Chernobyl disaster in Ukraine.

People walk along a flooded street in Ishimaki City, Miyagi Prefecture in northern Japan, after an earthquake and tsunami struck the area, March 13, 2011.

A car sits atop another in an area affected by an earthquake and tsunami in Miyako, Iwate prefecture March 14, 2011.

Oil leaks from ships swept by a tsunami in Fudai Village, Iwate Prefecture in northern Japan, after an earthquake struck the area March 14, 2011.

Televisions are scattered in a street in Hiachinohe, Aomori Prefecture in northern Japan, after an earthquake and tsunami struck the area, March 13, 2011.

A Japanese home is seen adrift in the Pacific Ocean, in this photograph taken on March 13, 2011 and released on March 14. Ships and aircrafts from the U.S. Navy's Ronald Reagan Carrier Strike Group are searching for survivors in the coastal waters near Sendai, Japan, in the wake of 8.9-magnitude earthquake and tsunami that officials say claimed at least 10,000 lives.

Smoke billows from fire-gutted vessels in waters off Kesennuma, Miyagi Prefecture in northeastern Japan March 12, 2011. Japan confronted devastation along its northeastern coast on Saturday, with fires raging and parts of some cities under water after a massive earthquake and tsunami that likely killed at least 1,000 people.

The official death toll from Japan’s huge earthquake-tsunami tragedy is approaching 7-thousand, already exceeding the 6,434 who died in the Great Hanshin earthquake of 1995, according to Japan’s National Police Agency. Read more: http://bit.ly/dHweez

A woman walks away from a message wall after writing a message to the victims of last week's earthquake and tsunami in Japan in central Seoul March 16, 2011.

Survivors react after collecting their belongings at their destroyed house in a village hit by an earthquake and tsunami in Otsuchi, northeast Japan March 17, 2011.

A man cries next to his destroyed house where his dead mother is still buried in the rubble at a devastated area hit by the earthquake and tsunami in Onagawa town in Miyagi Prefecture, March 17, 2011.

Caskets containing the bodies of earthquake and tsunami victims are arranged in a gymnastic hall in Rifu-cho, Miyagi prefecture, March 18, 2011. The area was devastated by a magnitude 9.0 earthquake and tsunami on March 11.

A doctor talks to evacuees from the vicinity of Fukushima nuclear plant, at an evacuation center set in a gymnasium in Yamagata, northern Japan, March 19, 2011, eight days after Japan's devastating earthquake and tsunami.

A Sony playstation controller is seen at an area that was devastated by last week's earthquake and tsunami, in Kesennuma, north Japan, March 19, 2011.

A train car swept by a tsunami lies in a heavily damaged cemetery in Onagawa, Miyagi Prefecture, northeastern Japan

A volunteer displays pictures which were found in the rubble of an area, devastated by the March 11 earthquake and tsunami, at a collection center for those who are looking for their personal belongings in Natori, northern Japan, April 12, 2011.

A man (bottom) looks for his personal belongings at a collection center for items found in the rubble of an area devastated by the March 11 earthquake and tsunami, in Natori, northern Japan, April 12, 2011.

A man looks at the damage caused by the earthquake and tsunami in Ofunato town, in Iwate Prefecture March 13, 2011. Strong aftershocks continued to shake Japan's main island as the desperate search pressed on for survivors from Friday's massive earthquake and tsunami. State broadcaster NHK said more than 10,000 people may have been killed as the wall of water hit, reducing whole towns to rubble.

The body of a victim is seen covered at a village destroyed by the earthquake and tsunami in Rikuzentakata in Iwate prefecture, northeast Japan March 15, 2011.

An anti-nuclear protester takes part in a rally in front of Tokyo Electric Power Co (TEPCO)'s headquarters in Tokyo April 15, 2011. TEPCO, has yet to determine how much it will have to pay residents and businesses near the Fukushima plant, who were forced to evacuate after the March 11 earthquake and tsunami caused deadly radiation leaks.

A man walks next to damaged cars at an area devastated by the March 11 earthquake and tsunami, in Sendai, Miyagi prefecture April 16, 2011.

A boy wearing a mask take part in an anti-nuclear protest in Tokyo April 16, 2011. About 1,500 protesters took to the streets in Tokyo's Shibuya district on Saturday, calling for the closure of nuclear power plants, after the incident at Tokyo Electric Power's Fukushima Nuclear Powerplant raised fears of radiation contamination.

Unopened canned drinks, damaged by the March 11 earthquake and tsunami, are seen at a drinks factory in Sendai, Miyagi prefecture April 16, 2011.

Cherry blossoms on a tree damaged by the March 11 earthquake and tsunami in Ofunato are seen next to fish near a damaged fish-processing plant in Ofunato, Iwate prefecture, April 18, 2011. The fish was likely washed up from the near by plant.

Policemen carry the body of a victim found amid the rubble in Rikuzentakata, Iwate prefecture, more than one month after the area was devastated by a 9.0 magnitude earthquake and tsunami, April 18, 2011.

A radiation monitor indicates 0.41 microsieverts per hour at Mutsuo Mito's dairy farm in Shinchimachi, Fukushima Prefecture, northern Japan, April 13, 2011, located about 50km from the tsunami-crippled nuclear reactor. Mito's farm has been throwing away about 1,200 litres of fresh milk daily and he has submitted milk samples to the government twice already, but have yet to receive a response as to whether they will be allowed to sell their milk since shipments of unprocessed milk . Generally, people are exposed to about 1 to 10 millisieverts of radiation a year from natural background radiation, caused by radioactive substances in the air and soil. One thousand microsieverts make 1 millisievert.

Tsunami victim Misako Okuda, 74, reacts after looking at an area that was devastated by the March 11 earthquake and tsunami, in Higashi-Matsushima, Miyagi prefecture, April 15, 2011.

A volunteer cleans photographs, which were found among rubble in an area devastated by the March 11 earthquake and tsunami, at a collection centre for those who are looking for their personal belongings in Otsuchi, Iwate prefecture April 17, 2011.

A girl wearing a hat sits in her stroller as she takes part in an anti-nuclear protest with her mother in Tokyo April 16, 2011. About 1,500 protesters took to the streets in Tokyo's Shibuya district on Saturday, calling for the closure of nuclear power plants, after the incident at Tokyo Electric Power's Fukushima Nuclear Powerplant raised fears of radiation contamination.

Japan's Chief Cabinet Secretary Yukio Edano (2nd R), in protective gear, inspects a devastated area hit by an earthquake and tsunami in Minamisoma, about 20 km (12 miles) from Tokyo Electric Power Co. (TEPCO)'s crippled Fukushima Daiichi Nuclear Power Plant in Fukushima, northern Japan April 17, 2011. Japan has expanded the 20 km evacuation zone around the plant because of high accumulated radiation.

Japan's Prime Minister Naoto Kan (C) speaks during a news conference at his official residence in Tokyo April 12, 2011. China said on Tuesday it was still concerned about Japan's nuclear calamity, a disaster Japan put on a par with the world's worst nuclear accident, Chernobyl, after new data showed more radiation had leaked from its earthquake-crippled power plant in the early days of the crisis than first thought.