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Nova: Japan's Killer Quake
The March 11, 2011, earthquake in Japan was the world´s fourth-largest earthquake since record keeping began in 1900 and the worst ever to shake Japan. The seismic shock wave released more than 4,000 times the energy of the largest nuclear test ever conducted; it shifted the earth´s axis by six inches and shortened the day by a few millionths of a second. Gain a unique look though science behind this catastrophe.
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