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Reiko Miura, 68, cries as she looks for her sister's son at a tsunami-hit area in Otsuchi, Iwate Prefecture, northern Japan, March 16. (AP)

The shore of Japan is seen before (L) and after a tsunami hit the area in this combination photo of satellite images provided by the German Aerospace Center. Pictures taken September 5, 2010 (L) and March 12, 2011. (REUTERS/DLR/Rapid Eye)

Medical staff use a Geiger counter to screen a woman for radiation exposure after she evacuated from an area within 20km (12.4 miles) radius of the Fukushima Daiichi nuclear plant. (Reuters)

Residents walk past debris in Otsuchi March 15. 12,000 out of a population of 15,000 in the town have disappeared following Friday's massive earthquake and tsunami. (Reuters/Aly Song)

Members of the Japan Self-Defense Force make their way through the ruins of the devastated residential area in Otsuchi as heavy snow falls March 16, 2011. In the fishermen town of Otsuchi in Iwate prefecture, 12,000 out of a population of 15,000 have disa

Japan's Emperor Akihito speaks during a televised address to the nation in Tokyo March 16. He sai problems at Japan's nuclear-power reactors were unpredictable and he was "deeply worried." (Reuters)

A screen displays stock prices in Tokyo March 16. The Nikkei index ended the morning up 4.37 pct after closing down 10.6 percent on Tuesday and 6.2 percent the day before. The fall wiped some $620 billion off the market. (Reuters/Issei Kato)

Japanese vehicles pass through the ruins of the leveled city of Minamisanriku, northeastern Japan, Tuesday March 15. (AP)

An officer at the Hong Kong Observatory shows a forecast trajectory of radiation releases from Japan during a news conference in Hong Kong Wednesday. Indicators in red triangles, blue squares and green stars project wind directions of different altitudes.

A man shops in a convenience store on Tuesday, where shelves on food aisles are left empty in Ofunato, northern Japan. (AP)