但是在此之前，地球物理学者们认为，这种俯冲带大地震仅仅在年轻的海洋地壳挤入地幔处才可能发生。

But geophysicists had thought that great subduction-zone earthquakes happened only where younger oceanic crust scrapes its way into the mantle.

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到了某个点，“压力压倒了摩擦力，”进行这次地质勘察的地球物理学者Ross s . Stein说，然后断裂就产生了。

At some point, said Ross s. Stein, a geophysicist with the geological survey, "the stress overwhelms that friction," and a rupture occurs.

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作为地球物理学者，他在美国航天航空局喷气动力实验室所做的研究，帮助在正确的时间和正确的位置发射宇宙飞船，并且使之准确到达目的地。

His research for NASA's Jet Propulsion Laboratory as a geophysicist helps launch spacecraft at the correct time and position to reach their exact destinations.

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