| DOI: | 10.1002/2015GL065367
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| 论文题名: | Detection of inner core solidification from observations of antipodal PKIIKP |
| 作者: | Cormier V.F.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9536
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| EISSN: | 1944-9267
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| 出版年: | 2015
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| 卷: | 42, 期:18 | | 起始页码: | 7459
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| 结束页码: | 7466
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| 语种: | 英语
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| 英文关键词: | dynamo
; inner core
; shear modulus
; solidification
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| Scopus关键词: | DC generators
; Elastic moduli
; Shear strain
; Back-scattered
; Bright spots
; Inner core
; Inner core boundary
; P-velocity
; Phase Change
; S velocity
; Seismic attenuation
; Solidification
; amplification
; backscatter
; grain size
; inner core
; melting
; observational method
; phosphorus
; prediction
; seismic attenuation
; solidification
; Calluna vulgaris
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| 英文摘要: | PKIIKP waves, reflected from the underside of the inner core boundary, are very sensitive to the S velocity in the uppermost 80 km of the inner core at antipodal distances, undergoing a phase change and a factor of 4 amplification as the distance approaches 180°. Modeled PKIIKP waveforms are consistent with a near-zero shear modulus in the uppermost inner core in a 20-40 km thick patch beneath the eastern equatorial hemisphere. This bright spot of PKIIKP reflection correlates with a thin zone of low P velocity inferred from the complexity of PKIKP waveforms sampling this patch. Estimates of grain sizes from seismic attenuation, the absence of backscattered PKiKP coda in this region, and a prediction for enhanced heat flow through this patch suggest that it is a region of solidification rather than melting. © 2015 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945242808&doi=10.1002%2f2015GL065367&partnerID=40&md5=69e6c63c08023b72a7ec0fde89188232
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/9151
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Department of Physics, University of Connecticut, Storrs, CT, United States
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| Recommended Citation: | |
Cormier V.F.. Detection of inner core solidification from observations of antipodal PKIIKP[J]. Geophysical Research Letters,2015-01-01,42(18).
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