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  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 中国科学院地球与行星物理重点实验室
Enhanced inner core fine-scale heterogeneity towards Earth's centre

文献类型：期刊论文

作者Pang, Guanning2,6; Koper, Keith D.6; Wu, Sin-Mei3,6; Wang, Wei4,7; Lasbleis, Marine5,8; Euler, Garrett1
刊名NATURE
出版日期2023-07-05
页码19
ISSN号0028-0836
DOI10.1038/s41586-023-06213-2
英文摘要Earth's inner core acquires texture as it solidifies within the fluid outer core. The size, shape and orientation of the mostly iron grains making up the texture record the growth of the inner core and may evolve over geologic time in response to geodynamical forces and torques(1). Seismic waves from earthquakes can be used to image the texture, or fabric, of the inner core and gain insight into the history and evolution of Earth's core(2-6). Here, we observe and model seismic energy backscattered from the fine-scale (less than 10 km) heterogeneities(7) that constitute inner core fabric at larger scales. We use a novel dataset created from a global array of small-aperture seismic arrays-designed to detect tiny signals from underground nuclear explosions-to create a three-dimensional model of inner core fine-scale heterogeneity. Our model shows that inner core scattering is ubiquitous, existing across all sampled longitudes and latitudes, and that it substantially increases in strength 500-800 km beneath the inner core boundary. The enhanced scattering in the deeper inner core is compatible with an era of rapid growth following delayed nucleation.
WOS关键词INTRINSIC ATTENUATION ; PKIKP CODA ; ANISOTROPY ; SCATTERING ; GROWTH ; MODEL ; IRON ; CONSTRAINTS ; BOUNDARY ; DYNAMICS
资助项目National Science Foundation[EAR-1722542]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:001024096100017
出版者NATURE PORTFOLIO
资助机构National Science Foundation ; National Science Foundation ; National Science Foundation ; National Science Foundation ; National Science Foundation ; National Science Foundation ; National Science Foundation ; National Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/111353]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Pang, Guanning
作者单位1.Los Alamos Natl Lab, Los Alamos, NM USA
2.Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14850 USA
3.Swiss Fed Inst Technol, Swiss Seismol Serv, Zurich, Switzerland
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
5.Bur Veritas Marine & Offshore, Paris, France
6.Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA
7.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA USA
8.Univ Nantes, Lab Planetol & Geosci, UMR 6112, CNRS, Nantes, France
推荐引用方式
GB/T 7714		 Pang, Guanning,Koper, Keith D.,Wu, Sin-Mei,et al. Enhanced inner core fine-scale heterogeneity towards Earth's centre[J]. NATURE,2023:19.
APA Pang, Guanning,Koper, Keith D.,Wu, Sin-Mei,Wang, Wei,Lasbleis, Marine,&Euler, Garrett.(2023).Enhanced inner core fine-scale heterogeneity towards Earth's centre.NATURE,19.
MLA Pang, Guanning,et al."Enhanced inner core fine-scale heterogeneity towards Earth's centre".NATURE (2023):19.

入库方式： OAI收割

来源：地质与地球物理研究所

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