They think that a new subductionzone might occur at the western edge of the Atlantic Ocean.
他们认为，一个新的俯冲带可能会出现在大西洋的西部边缘。
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In the past few centuries, the subductionzone off the coast of Sendai has generated earthquakes of up to magnitude 8 or so, but nothing as powerful as a 9, which releases 30 times more energy.
The 8.9 magnitude earthquake on Friday, the largest ever recorded in Japan, occurred in a subductionzone, where one of the earth’s tectonic plates is sliding beneath another.