subduction zone

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‘The Pacific Northwest - what we call the Cascadia Subduction Zone - has the same kind of characteristics as the fault beneath Japan, ’ seismologist James Gaherty told CBS.
哥伦比亚大学雷蒙德研究中心的地震学家James Gaherty告诉CBS记者说：“太平洋的东北部地区被我们称为‘卡迪亚断层带’。此处的断层结构与日本地表下的断层是同一种。
In the past few centuries, the subduction zone 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.
在过去的几个世纪里，仙台沿海地区的俯冲带发生的地震震级最大才达到8级，从未达到过9级，而这次地震释放的能量是8级地震的30倍。
Moreover, the geometry of the subduction zone has much influence on the location of the large event.
此外，俯冲带的几何特征对大地震的震源位置有很大的影响。
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The large subduction zone earthquakes are responsible for most of the ocean-wide tsunamis, such as the recent tsunami in Japan.

The Cascadia Subduction Zone, just off the regional coastline, produced a mega-quake in the year 1700.
NPR: Report Makes Chilling Forecast On Northwest Quake
Instead of occurring at a plate boundary along an area called a subduction zone, where one tectonic plate is diving beneath another, this earthquake occurred in the middle of an oceanic plate, where the faults in the crust essentially moved from side to side instead of up and down.
MSN: Why this Indonesia quake didn't spark a monster tsunami
But on that fateful Friday, when the North American plate slid over the Pacific plate along a subduction zone running 130km (80 miles) off the Pacific coast of northern Japan, the shock leapt from the first segment to a second and on to a third, extending the fault zone some 400km and increasing its intensity more than 30-fold.
ECONOMIST: The myth and reality of the Japanese earthquake

an area where two continental plates (= large layers of rock that form the earth's surface) meet and where there are often earthquakes