Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL081130 |
Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii | |
Sun, D.1,2; Helmberger, D.3; Lai, V. H.3; Gurnis, M.3; Jackson, J. M.3; Yang, H. -Y.1,2 | |
2019-03-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2019 |
卷号 | 46期号:6页码:3142-3152 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | At the core-mantle boundary, most observed ultralow velocity zones (ULVZs) cluster along the edges of the large low shear velocity provinces (LLSVPs) and provide key information on the composition, dynamics, and evolution of the lower mantle. However, their detailed structure near slab-like structures beneath the mid-Pacific remains particularly challenging because of the lack of station coverage. While most studies of ULVZs concentrate on SKS-complexity, here we report on the multipathing of ScS, which expands the sampling for ULVZs. We find the strongest multipathing along a ULVZ patch located just south of Hawaii and the far northeastern edge of the LLSVP, in a zone similar to 200 km in width and extending 600 km southward. The anomalous ScS travel times and distorted S-diff waveforms further reveal patches interrupted by observed enhanced D '' indicative of slab-debris influence on the complexity of the northeastern boundary of the mid-Pacific LLSVP. Plain Language Summary Mapping the detailed boundaries of the large low shear velocity provinces at the core-mantle boundary is one of the keys to understanding the dynamics of the lower mantle. However, imaging the lower mantle beneath mid-Pacific is difficult because of the limited seismic ray coverage and seismic phases used. In this study, we identify a new seismic signal, multipathing of ScS, which can be modeled with an ultralow velocity zone sitting at the far edge of the mid-Pacific large low shear velocity province. The locations of the ultralow velocity zone and the nearby slab demonstrate that the complexities of the northeastern boundary of the mid-Pacific LLSVP are strongly affected by the slab reaching to the core-mantle boundary. |
英文关键词 | ULVZ mid-Pacific LLSVP ScS |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000464650400015 |
WOS关键词 | CORE-MANTLE BOUNDARY ; SEISMIC EVIDENCE ; STRUCTURE BENEATH ; PHASE-TRANSITION ; ULVZ STRUCTURE ; NORMAL-MODE ; VELOCITY ; BASE ; TOMOGRAPHY ; LAYER |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/181762 |
专题 | 气候变化 |
作者单位 | 1.Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei, Anhui, Peoples R China; 2.Natl Geophys Observ Mengcheng, Mengcheng, Anhui, Peoples R China; 3.CALTECH, Seismol Lab, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Sun, D.,Helmberger, D.,Lai, V. H.,et al. Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii[J]. GEOPHYSICAL RESEARCH LETTERS,2019,46(6):3142-3152. |
APA | Sun, D.,Helmberger, D.,Lai, V. H.,Gurnis, M.,Jackson, J. M.,&Yang, H. -Y..(2019).Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii.GEOPHYSICAL RESEARCH LETTERS,46(6),3142-3152. |
MLA | Sun, D.,et al."Slab Control on the Northeastern Edge of the Mid-Pacific LLSVP Near Hawaii".GEOPHYSICAL RESEARCH LETTERS 46.6(2019):3142-3152. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论