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Scientists have discovered the cause of the earthquake that caused the devastating tsunami in Japan in March 2011, and evidence suggests that there is a threat of future massive quakes in the same area.

The devastating tsunami that struck Japan’s Tohoku region in March 2011 was touched off by a submarine earthquake far more massive than anything geologists had expected in that zone.
Now, a team of scientists including McGill University geologist Christie Rowe, has published a set of studies in the journal Science that shed light on what caused the dramatic displacement of the seafloor off the north-eastern coast of Japan. The findings also suggest that other zones in the northwest Pacific may be at risk of similar huge earthquakes.
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Shortly after the Tohoku Megathrust Earthquake struck off the coast of Japan on March 11, 2011, something strange happened in Norway. People watched in astonishment and fear as tight wave action in the normally quiet fjords made them appear to boil. The water became roiled with 5 foot waves in the Auruland-Flam Fjord, and the condition waxed and waned for hours. The cause was a mystery until recently, but now a new study has shown that the wave action in Norway was linked to the Japanese earthquake.
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People have been trying to predict earthquakes (NOTE: Subscribers can still listen to this show) for thousands of years. Twenty-three hundred years ago, hordes of mice, snakes, and insects fled the Greek city of Helike on the Gulf of Corinth. In National Geographic News, Richard Lovett quotes the ancient Roman writer Claudius Aelianus as saying, "After these creatures departed, an earthquake occurred in the night,. The city subsided; an immense wave flooded and Helike disappeared."
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A process that began 50 million years ago– the slow motion breakup of the Indo-Australian tectonic plate into two pieces–isn’t over yet. In fact, they think it caused the two massive April 11 earthquakes beneath the Indian Ocean off the coast of the Indonesian island of Sumatra.

The first quake was a magnitude 8.7, 20 times more powerful than California’s long anticipated "big one." It tore a complex network of faults deep in the ocean floor. The violence triggered unusually large aftershocks thousands of miles away, off the US West Coast.
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