oceanic crust

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But geophysicists had thought that great subduction-zone earthquakes happened only where younger oceanic crust scrapes its way into the mantle.
但是在此之前，地球物理學者們認爲，這種頫沖帶大地震僅僅在年輕的海洋地殼擠入地幔処才可能發生。
The hypothesis was substantiated soon afterward by the discovery that periodic reversals of the Earth’s magnetic field are recorded in the oceanic crust.
這個假定不久之後爲發現所証實。該發現表明地球磁場周期性的逆轉被記錄在海洋地殼中。
By 2011 scientists aboard a Japanese deep-sea drilling ship called Chikyu hope to start drilling through a thin piece of oceanic crust to reach Earth's mantle.
2011年，科學家們將登上日本一艘名爲“地球號”的深海鑽井船，他們希望通過鑽開一塊薄的大洋地殼到達地幔。

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.
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the part of the outer rocky layer of the earth that is under the oceans and is thinner than the layer under the land