Marine species survived rafting thousands of kilometers on debris swept into the water by the giant wave, scientists say.

Regulators are warning that the Asian country’s nuclear power infrastructure may still be vulnerable to earthquakes.

A dock dislodged by 2011's Japanese tsunami washes ashore in Oregon, posing an invasive species threat, but also serving as an unprecedented natural experiment in open-ocean dispersal.

Researchers map the fallout from Fukushima.