Nobuhisa Iwai prays for his friend killed by the tsunami at Arahama district in Sendai. Japan today marked the second anniversary of the ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. (Photo by Toru Yamanaka/AFP Photo)

An elderly man sits as he and with his wife (not pictured) visit a cemetery to pay respects to their son who was killed in the March 2011 tsunami, in Minamisoma in Fukushima prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. (Photo by Yoshikazu Tsuno/AFP Photo)

Wrecked vehicles remain in a field of reeds in Namie, two years after the March 11, 2011 tsunami and earthquake, near the striken TEPCO's Fukushima Dai-ichi nuclear plant in Fukushima prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. (Photo by Yoshikazu Tsuno/AFP Photo)

Japan's Prime Minister Shinzo Abe (L) bows to Emperor Akihito (2nd R) and Empress Michiko during the national memorial service for the victims of the March 11, 2011 earthquake and tsunami, in Tokyo March 11, 2013. Japan honoured the victims of its worst disaster since World War Two on Monday: the March 11, 2011 earthquake, tsunami and nuclear crisis that killed almost 19,000 people and stranded 315,000 evacuees, including refugees who fled radiation from the devastated Fukushima atomic plant. (Photo by Junji Kurokawa/Reuters/Pool)

Kesennuma city is seen during a lightshow on March 11, 2013 in Kesennuma, Japan. Japan is commemorating the second anniversary of the 2011 Magnitude 9.0 earthquake and subsequent tsunami that claimed more than 18,000 lives. (Photo by Athit Perawongmetha)

A Buddhist monk prays toward the sea on March 11, 2013 in Ootsuti, Iwate prefecture, Japan. On March 11 Japan commemorates the second anniversary of the magnitude 9.0 earthquake and tsunami that claimed more than 18,000 lives. (Photo by Ken Ishii/AP Photo)

People observe a moment of silence for the victims of the March 11, 2011 earthquake and tsunami during an event at a park in Tokyo, at 2:46 p.m. on Monday. (Photo by Itsuo Inouye/AP Photo)

A woman on the coast of Tairausuiso in Iwaki, Fukushima Prefecture, prays Monday for family members killed in the earthquake and tsunami on March 11, 2011. (Photo by Kyodo)

A worker walks behind a white plastic plate cutout of the words of a local businessperson, declaring determination to reopen the business, in a tsunami-stricken area in Minamisanriku, Miyagi prefecture, northern Japan, Monday, March 11, 2013. Japan marked the second anniversary on Monday of a devastating earthquake and tsunami that left nearly 19,000 people dead or missing. The words mean; I will restart my business from zero like my ancestor. (Photo by Shizuo Kambayashi/AP Photo)

A family visits the place where their house was swept away by the tsunami in Kesennuma, Miyagi Prefecture, Japan, on Sunday. (Photo by Shizuo Kambayashi/AP Photo)

A replica of the pine tree which survived the March 11, 2011 earthquake and tsunami, is seen in Rikuzentakata, Iwate Prefecture, Japan, on Saturday. The tree, dubbed the “miracle pine,” is now being restored after preservative treatment. (Photo by Shizuo Kambayashi/AP Photo)

People offer prayers during a moment of silence in front of what is left of a disaster control center in an area devastated by the March 11, 2011 earthquake and tsunami in Minamisanriku, Miyagi Prefecture. Japan marked the second anniversary of the devastating disasters that left nearly 19,000 people dead or missing. (Photo by Shizuo Kambayashi/Associated Press)

Police officers search for tsunami victims two years after, at a mud-covered riverside field near the Okawa elementary school in Ishinomaki city, Miyagi prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. (Photo by Toshifumi Kitamura/AFP Photo)

A man prays to mourn victims of the March 11, 2011, earthquake and tsunami in front of a ship brought ashore by the disaster in Kesennuma, Miyagi Prefecture, Japan. (Photo by Kyodo via Reuters)

A woman lights candles to pay tribute to the victims of the March 11, 2010 earthquake and tsunami at a make-shift altar in a park in Tokyo. (Photo by Junji Kurokawa/Associated Press)