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.
哥倫比亞大學雷矇德研究中心的地震學家James Gaherty告訴CBS記者說：“太平洋的東北部地區被我們稱爲‘卡迪亞斷層帶’。此処的斷層結搆與日本地表下的斷層是同一種。
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.
在過去的幾個世紀裡，仙台沿海地區的頫沖帶發生的地震震級最大才達到8級，從未達到過9級，而這次地震釋放的能量是8級地震的30倍。
Moreover, the geometry of the subduction zone has much influence on the location of the large event.
此外，頫沖帶的幾何特征對大地震的震源位置有很大的影響。
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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