The tsunami that devastated the north-east coast of Japan on 11 March was created by at least two wave fronts that merged to form a far more destructive "double tsunami", scientists in the US have said. Waves created when a magnitude-9.0 earthquake struck off the coast came together to create a "merging tsunami" captured by satellites for the first time, according to Nasa and researchers at Ohio State University. Peaks and troughs on the ocean floor helped channel the waves into one huge wave, amplifying its destructive force, they said. Read More

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