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DOI | 10.1029/2021GL094784 |
Shear-wave Anisotropy in the Earth’s Inner Core | |
Sheng Wang; Hrvoje Tkalč; ić | |
2021-09-21 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Earth’s inner core anisotropy is widely used to infer the deep Earth's evolution and present dynamics. Many compressional-wave anisotropy models have been proposed based on seismological observations. In contrast, inner-core shear-wave (J-wave) anisotropy – on a par with the compressional-wave anisotropy – has been elusive. Here we present a new class of the J-wave anisotropy observations utilizing earthquake coda-correlation wavefield. We establish that the coda-correlation feature I2-J, sensitive to J-wave speed, exhibits time and amplitude changes when sampling the inner core differently. J-waves traversing the inner core near its center travel faster for the oblique than equatorial angles relative to the Earth’s rotation axis by at least ∼5 s. The simplest explanation is the J-wave cylindrical anisotropy with a minimum strength of ∼0.8%, formed through the lattice-preferred-orientation mechanism of iron. Although we cannot uniquely determine its stable iron phase, the new observations rule out one of the body-centered-cubic iron models. |
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/338818 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Sheng Wang,Hrvoje Tkalč,ić. Shear-wave Anisotropy in the Earth’s Inner Core[J]. Geophysical Research Letters,2021. |
APA | Sheng Wang,Hrvoje Tkalč,&ić.(2021).Shear-wave Anisotropy in the Earth’s Inner Core.Geophysical Research Letters. |
MLA | Sheng Wang,et al."Shear-wave Anisotropy in the Earth’s Inner Core".Geophysical Research Letters (2021). |
条目包含的文件 | 条目无相关文件。 |
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