Modern mermaids: New floats image the deep Earth
Modern mermaids: New floats image the deep Earth
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现代美人鱼：新花车描绘地球深处
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
G. Nolet
中科院分区：
文献类型：
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作者：
Y. Hello;A. Ogé;A. Sukhovich;G. Nolet
科学家们通过使用一种叫做地震断层扫描的方法来了解地球深处的结构。与计算机断层扫描（CT）扫描大脑类似，地震断层扫描利用地震P波到达时间的延迟，对地球内部地震波速度的变化进行扫描和三维图像。延迟的模式表明了地幔和地核的热异常或成分异常，例如由寒冷的海洋岩石圈下沉或热羽流上升引起的异常。大陆地区有大量关于这种延迟的观测资料；美国的观测数量特别高，因为作为美国国家科学基金会地球望远镜计划的一个分支，美国阵列项目的一部分，目前临时安装了密集的观测站，并在很大范围内移动。相比之下，海洋中没有类似的传感器密度
Scientists get a window into deep Earth structures by using a method called seismic tomography. Similar to computed tomography (CT) scans of the brain, seismic tomography uses delays in the arrival times of seismic P waves to make scans and three-dimensional images of the variations in seismic wave speed in the Earth's interior. Patterns in the delays indicate thermal or compositional anomalies in the Earth's mantle and core, such as those caused by sinking cold oceanic lithosphere or rising hot thermal plumes. A large number of observations of such delays are available for continental regions; the number of observations for the United States is especially high due to a dense deployment of stations currently being installed temporarily and moved across a large area as part of the USArray project, a branch of the U.S. National Science Foundation's EarthScope program. In contrast, no comparable sensor density has been available in the oceans