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  2. 地质与地球物理研究所
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  4. 中国科学院地球与行星物理重点实验室
Small-scale heterogeneities at the bottom of the lower mantle beneath the northern Bay of Bengal and the northern Gulf of Mexico by the analysis of PKP precursors

文献类型：期刊论文

作者Guan, Yurui4; Zhang, Baolong1,2,3,4; Lu, Yan2,3,4; Hao, Jinlai2,3,4; Li, Juan2,3,4; Ai, Yinshuang2,3,4
刊名GEOPHYSICAL JOURNAL INTERNATIONAL
出版日期2023-12-05
卷号236期号:2页码:819-833
ISSN号0956-540X
关键词Composition and structure of the mantle Body waves Wave scattering and diffraction
DOI10.1093/gji/ggad440
英文摘要The bottom of the lower mantle is a key region for material circulation and energy exchange within the Earth, with extremely high heterogeneity and complex dynamics processes. Although tomography models have revealed the large-scale velocity structure at the bottom of the lower mantle, the nature of the small-scale lateral heterogeneity structure remains controversial due to resolution limitations. The scattering observations of PKP precursors have been widely used to constrain the small-scale structures at the bottom of the lower mantle due to their special sampling paths and arrival time characteristics. This study cross-validates the presence of scatterers at the bottom of the lower mantle in the northern Bay of Bengal and the northern Gulf of Mexico through migration and array analysis of PKP precursors sampled from seismic arrays in the Sichuan-Yunnan and adjacent areas in China. The forward modelling of the envelope of PKP precursors using the Monte Carlo seismic phonon method reveals that their P-wave velocity perturbations are 0.3 and 0.55 per cent in each area, respectively. Based on the distribution range of the small-scale scatterers, we infer that the northern Bay of Bengal scatterer lies within 200 km above the core-mantle boundary, whereas the thickness of the scattering layer in the northern Gulf of Mexico is approximately 250 km. We propose that the small-scale lateral heterogeneities observed in both regions originate from subducted slabs and may have been transitioned into post-perovskite.
WOS关键词STRONG SEISMIC SCATTERERS ; POST-PEROVSKITE PHASE ; LOW VELOCITY ZONES ; BOUNDARY TOPOGRAPHY ; WAVE ; PCP ; CONSTRAINTS ; PACIFIC ; D'' ; DEFORMATION
资助项目China Earthquake Administration[42030311] ; China Earthquake Administration[42274074] ; China Earthquake Administration[42074063] ; China Earthquake Administration[41874066] ; National Natural Science Foundation of China[IGGCAS-201904] ; Key Research Program of the Institute of Geology and Geophysics, CAS[2017YFC1500302] ; National Key Research and Development Program of China
WOS研究方向Geochemistry & Geophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:001115635700003
资助机构China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; China Earthquake Administration ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/111521]  
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Lu, Yan
作者单位1.Chinese Acad Sci, Innovat Acad Precis Measurement Sci & Technol, State Key Lab Geodesy & Earths Dynam, Wuhan 430071, Peoples R China
2.Chinese Acad Sci, Heilongjiang Mohe Observ Geophys, Inst Geol & Geophys, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Guan, Yurui,Zhang, Baolong,Lu, Yan,et al. Small-scale heterogeneities at the bottom of the lower mantle beneath the northern Bay of Bengal and the northern Gulf of Mexico by the analysis of PKP precursors[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2023,236(2):819-833.
APA Guan, Yurui,Zhang, Baolong,Lu, Yan,Hao, Jinlai,Li, Juan,&Ai, Yinshuang.(2023).Small-scale heterogeneities at the bottom of the lower mantle beneath the northern Bay of Bengal and the northern Gulf of Mexico by the analysis of PKP precursors.GEOPHYSICAL JOURNAL INTERNATIONAL,236(2),819-833.
MLA Guan, Yurui,et al."Small-scale heterogeneities at the bottom of the lower mantle beneath the northern Bay of Bengal and the northern Gulf of Mexico by the analysis of PKP precursors".GEOPHYSICAL JOURNAL INTERNATIONAL 236.2(2023):819-833.

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来源：地质与地球物理研究所

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