| DOI: | 10.1002/2015GL065506
|
| 论文题名: | Seismic anisotropy in the lowermost mantle near the Perm Anomaly |
| 作者: | Long M.D.; Lynner C.
|
| 刊名: | Geophysical Research Letters
|
| ISSN: | 0094-9213
|
| EISSN: | 1944-8944
|
| 出版年: | 2015
|
| 卷: | 42, 期:17 | | 起始页码: | 7073
|
| 结束页码: | 7080
|
| 语种: | 英语
|
| 英文关键词: | LLSVP
; lowermost mantle
; Perm Anomaly
; seismic anisotropy
|
| Scopus关键词: | Anisotropy
; Seismology
; Shear waves
; Large Low Shear Velocity Provinces (LLSVPs)
; Large structures
; Lateral variations
; LLSVP
; Lowermost mantle
; Perm Anomaly
; Seismic anisotropy
; Shear wave velocity
; Shear flow
; anomaly
; deformation
; mantle
; permafrost
; S-wave
; seismic anisotropy
; wave velocity
; Eurasia
|
| 英文摘要: | The lower mantle is dominated by two large structures with anomalously low shear wave velocities, known as Large Low-Shear Velocity Provinces (LLSVPs). Several studies have documented evidence for strong seismic anisotropy at the base of the mantle near the edges of the African LLSVP. Recent work has identified a smaller structure with similar low-shear wave velocities beneath Eurasia, dubbed the Perm Anomaly. Here we probe lowermost mantle anisotropy near the Perm Anomaly using the differential splitting of SKS and SKKS phases measured at stations in Europe. We find evidence for lowermost mantle anisotropy in the vicinity of the Perm Anomaly, with geographic trends hinting at lateral variations in anisotropy across the boundaries of the Perm Anomaly as well as across a previously unsampled portion of the African LLSVP border. Our observations suggest that deformation is concentrated at the boundaries of both the Perm Anomaly and the African LLSVP. ©2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84943352281&doi=10.1002%2f2015GL065506&partnerID=40&md5=1aedb31050e5855269644285b031ad35
|
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8829
|
| Appears in Collections: | 科学计划与规划
气候变化与战略
|
|
There are no files associated with this item.
|
|
作者单位: | Department of Geology and Geophysics, Yale University, New Haven, CO, United States
|
| Recommended Citation: | |
Long M.D.,Lynner C.. Seismic anisotropy in the lowermost mantle near the Perm Anomaly[J]. Geophysical Research Letters,2015-01-01,42(17).
|
|
|