论文标题
测序地震图：核心掩体边界区域散射的综合视图
Sequencing seismograms: A panoptic view of scattering in the core-mantle boundary region
论文作者
论文摘要
地震波的散射可以揭示地下结构，但通常以专注于特定目标区域的零碎方式。我们使用一种称为“音序器”的多种学习算法来分析沿着核心掩体边界衍射的数千个波浪图，并获得跨太平洋地区散射的综合视图。在近一半的衍射波形中，我们检测到岩体壳边界附近的三维结构散布的地震波。这些分散的到达的患病率表明该区域占据了普遍的侧向异质性。我们的分析揭示了由于夏威夷下方的羽流和先前未识别的超速度区域下方的羽流引起的大声信号。这些观察结果说明了如何灵活地检测出可靠的模式的方法，几乎没有用户监督可以揭示对深层地球的独特见解。
Scattering of seismic waves can reveal subsurface structures but usually in a piecemeal way focused on specific target areas. We used a manifold learning algorithm called "the Sequencer" to simultaneously analyze thousands of seismograms of waves diffracting along the core-mantle boundary and obtain a panoptic view of scattering across the Pacific region. In nearly half of the diffracting waveforms, we detected seismic waves scattered by three-dimensional structures near the core-mantle boundary. The prevalence of these scattered arrivals shows that the region hosts pervasive lateral heterogeneity. Our analysis revealed loud signals due to a plume root beneath Hawaii and a previously unrecognized ultralow-velocity zone beneath the Marquesas Islands. These observations illustrate how approaches flexible enough to detect robust patterns with little to no user supervision can reveal distinctive insights into the deep Earth.
