Sequencing seismograms: A panoptic view of scattering in the core-mantle boundary region

doi:10.1126/science.aba8972

GSTDTAP > 气候变化

DOI	10.1126/science.aba8972
	Sequencing seismograms: A panoptic view of scattering in the core-mantle boundary region
	D. Kim; V. Lekić; B. Ménard; D. Baron; M. Taghizadeh-Popp
	2020-06-12
发表期刊	Science
出版年	2020
英文摘要	Structures illuminated by seismic waves at the core-mantle boundary of the Earth are traditionally found by focusing on a specific target area. Kim et al. used an unsupervised manifold learning algorithm called “the Sequencer” to automatically detect anomalies in seismic data (see the Perspective by Miller). Using this technique, they uncovered structures at the core-mantle boundary across the entire Pacific region all at once. They found many structures previously identified, but also a new, ultra-low-velocity zone beneath the Marquesas Islands. Science , this issue p. [1223][1]; see also p. [1183][2] 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. [1]: /lookup/doi/10.1126/science.aba8972 [2]: /lookup/doi/10.1126/science.abc3134
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/274466
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	D. Kim,V. Lekić,B. Ménard,et al. Sequencing seismograms: A panoptic view of scattering in the core-mantle boundary region[J]. Science,2020.
APA	D. Kim,V. Lekić,B. Ménard,D. Baron,&M. Taghizadeh-Popp.(2020).Sequencing seismograms: A panoptic view of scattering in the core-mantle boundary region.Science.
MLA	D. Kim,et al."Sequencing seismograms: A panoptic view of scattering in the core-mantle boundary region".Science (2020).