Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL087530 |
Poloidal‐ and toroidal‐mode mantle flows underneath the Cascadia Subduction Zone | |
Hejun Zhu; Xueyan Li; Jidong Yang; Robert J. Stern; David E. Lumley | |
2020-05-16 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
英文摘要 | Several hypotheses have been proposed to explain intriguing circular shear wave splitting patterns in the Pacific Northwest, invoking either 2‐D entrained flows or 3‐D return flows. Here, we present some hitherto unidentified, depth‐dependent anisotropic signatures to reconcile different conceptual models. At depths shallower than 200~km, the fast propagation directions of seismic waves to the west of the Rocky Mountain are aligned sub‐parallel to the subduction direction of the Juan de Fuca and Gorda Plates. This pattern is consistent with previous onshore/offshore shear wave splitting measurements, and indicates that 2‐D entrained flows dominate at shallower depths. From 300 to 500~km, two large‐scale return flows are revealed, one circulating around Nevada and Colorado, the other running around the edge of the descending Juan de Fuca slab. These observations suggest the development of toroidal‐mode mantle flows, driven by the fast rollback of the narrow, fragmented Juan de Fuca and Gorda slabs. |
领域 | 气候变化 |
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/267582 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Hejun Zhu,Xueyan Li,Jidong Yang,等. Poloidal‐ and toroidal‐mode mantle flows underneath the Cascadia Subduction Zone[J]. Geophysical Research Letters,2020. |
APA | Hejun Zhu,Xueyan Li,Jidong Yang,Robert J. Stern,&David E. Lumley.(2020).Poloidal‐ and toroidal‐mode mantle flows underneath the Cascadia Subduction Zone.Geophysical Research Letters. |
MLA | Hejun Zhu,et al."Poloidal‐ and toroidal‐mode mantle flows underneath the Cascadia Subduction Zone".Geophysical Research Letters (2020). |
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