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Breaking plates

机译:碎板

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摘要

Some of the consequences of the motion of Earth's tectonic plates are quite evident: various mountain chains for instance. Others, such as events occurring deep in subduction zones where one plate plunges beneath another, can be seen only indirectly through seismic imaging techniques. The approach allows the structure of Earth's interior to be reconstructed from observed seismograms, and it continues to pay dividends. An example appears on page 763 of this issue, where Levin et al. argue that they have detected two instances of break-up of a subducting slab at the junction of two oceanic plates. There are indications that slab disintegration has occurred where oceanic and continental plates collide. But because earthquake activity is uniformly distributed with depth in subducting oceanic plates, it had seemed that purely oceanic plates maintain their integrity.
机译:地球构造板块运动的某些后果十分明显:例如各种山脉。其他事件,例如发生在俯冲带深处的事件,其中一个板块坠入另一个板块之下,只能通过地震成像技术间接看到。该方法允许根据观测到的地震图重建地球内部结构,并继续带来收益。一个示例出现在本期的第763页上,其中Levin等人。他们辩称,他们在两个大洋板块的交界处发现了两个俯冲板破裂的实例。有迹象表明,板块在海洋和大陆板块碰撞时发生了崩解。但是,由于俯冲大洋板块的地震活动在深度上是均匀分布的,因此看来纯大洋板块保持了其完整性。

著录项

  • 来源
    《Nature》 |2002年第6899期|p.736-737|共2页
  • 作者

    J. Huw Davies;

  • 作者单位

    Department of Earth Sciences, Cardiff University, Cardiff CF10 3YE, UK;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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