Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL075049 |
Constraints on Inner Core Anisotropy Using Array Observations of P ' P ' | |
Frost, Daniel A.1; Romanowicz, Barbara1,2,3 | |
2017-11-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:21 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; France |
英文摘要 | Recent studies of PKPdf travel times suggest strong anisotropy (4% or more) in the quasi-western inner core hemisphere. However, the availability of paths sampling at low angles to the Earth's rotation axis (the fast axis) is limited. To augment this sampling, we collected a travel time data set for the phase P'P'df (PKPPKPdf), for which at least one inner core leg is quasi-polar, at two high latitude seismic arrays. We find that the inferred anisotropy is weak (on the order of 0.5 to 1.5%), confirming previous results based on a much smaller P'P' data set. While previous models of inner core anisotropy required very strong alignment of anisotropic iron grains, our results are more easily explained by current dynamic models of inner core growth. We observe large travel time anomalies when one leg of P'P'df is along the South Sandwich to Alaska path, consistent with PKPdf observations, and warranting further investigation. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418572900021 |
WOS关键词 | DIFFERENTIAL TRAVEL-TIMES ; DEEP EARTH ; P-WAVE ; MANTLE ; HETEROGENEITY ; MODEL ; TOMOGRAPHY ; PKP ; RESIDUALS ; BOUNDARY |
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/28991 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif Berkeley, Earth & Planetary Sci, Berkeley, CA 94720 USA; 2.Inst Phys Globe Paris, Paris, France; 3.Coll France, Paris, France |
推荐引用方式 GB/T 7714 | Frost, Daniel A.,Romanowicz, Barbara. Constraints on Inner Core Anisotropy Using Array Observations of P ' P '[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(21). |
APA | Frost, Daniel A.,&Romanowicz, Barbara.(2017).Constraints on Inner Core Anisotropy Using Array Observations of P ' P '.GEOPHYSICAL RESEARCH LETTERS,44(21). |
MLA | Frost, Daniel A.,et al."Constraints on Inner Core Anisotropy Using Array Observations of P ' P '".GEOPHYSICAL RESEARCH LETTERS 44.21(2017). |
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