The Japan Meteorological Agency said a local tsunami of up to one metre (3.3 feet) could impact the Pacific coastline after the quake.
Wall will block groundwater from nearby hillsides that has been flowing under the plant and mixing with polluted water already there.
The world has moved on since the 1986 catastrophe, but one thing hasn't changed very much: The dead trees, plants and leaves at the contaminated site.
Radiation from Japan's leaking nuclear power plant has reached waters off the shore of Canada, though it's not dangerous.
As radioactive water from a Japanese nuclear reactor tsunami nears the U.S. -- it is expected to hit in 2014 -- can we be sure it's safe?
Six workers at Japan's crippled Fukushima nuclear power plant were doused with radioactive water from a desalination system Wednesday.
The leaking Fukushima nuclear plant has dumped more than 1,000 tons of polluted water into the sea after a typhoon raked the facility.
New explorable images from the Japanese coast devastated by the 2011 tsunami have been posted online.
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