Most of the rocks might be originally fragments of oceanic rocks introduced during plate subduction.

这些岩石大部分可能为板块俯冲过程中带入的大洋岩石残片。

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Therefore the formation of these rocks is related to plate subduction.

因而这些岩石的形成与板块俯冲有关。

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The eruption of Mount St. Helens in 1980 was the direct result of plate subduction.

圣海伦火山在 1980 年的喷发是板块沉降的直接结果。

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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

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

Although they are sometimes produced by landslides on the seafloor, significant tsunamis are typically created by subduction earthquakes, when one massive oceanic plate suddenly lurches deeper beneath another plate, shoving up a huge section of the seafloor.

MSN: Why this Indonesia quake didn't spark a monster tsunami