DOI: 10.1002/2016GL069890
论文题名: GPS constraints on broad scale extension in the Ethiopian Highlands and Main Ethiopian Rift
作者: Birhanu Y. ; Bendick R. ; Fisseha S. ; Lewi E. ; Floyd M. ; King R. ; Reilinger R.
刊名: Geophysical Research Letters
ISSN: 0094-8928
EISSN: 1944-8659
出版年: 2016
卷: 43, 期: 13 起始页码: 6844
结束页码: 6851
语种: 英语
英文关键词: continental dynamics
; East African Rift
; Ethiopian Highlands
; GPS
Scopus关键词: Global positioning system
; Potential energy
; Continent scale
; Distributed deformation
; East African Rift
; Ethiopian Highlands
; Finite strain
; Gravitational potential energy
; Magmatisms
; Main Ethiopian Rift
; Strain rate
; continental drift
; deformation
; extensional tectonics
; GPS
; gravity field
; magmatism
; strain rate
; velocity profile
; East African Rift
; Eritrea
; Ethiopia
; Ethiopian Highlands
; Ethiopian Rift
; Nubia
; Somali
英文摘要: Measurements from GPS sites spanning the Ethiopian Highlands, Main Ethiopian Rift, and Somali Platform in Ethiopia and Eritrea show that present-day finite strain rates throughout NE Africa can be approximated at the continent scale by opening on the MER. Most sites in the Ethiopian Highlands are consistent with the motion of the Nubian plate at the level of 1 mm/yr with 95% confidence. However, sites at least as far as 60 km west of the rift show higher velocities relative to the stable Nubian frame of 1–2 mm/yr, requiring a combination of localized and distributed deformation to accommodate the African extensional domain. Off-rift velocities are consistent with ongoing strain related to either high gravitational potential energy or intrusive magmatism away from midrift magmatic segments either on the western rift margin or within the Ethiopian Highlands, especially when combined with likely rheological differences between the Ethiopian Rift and Highlands. Velocities from the Somali Platform are less well determined with uncertainties and residuals from a Somali frame definition at the level of 2–3 mm/yr but without spatially correlated residuals. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978033474&doi=10.1002%2f2016GL069890&partnerID=40&md5=83e1274a31148e24dc3e69075847bc86
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9891
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 Geosciences, University of Montana, Missoula, MT, United States
Recommended Citation:
Birhanu Y.,Bendick R.,Fisseha S.,et al. GPS constraints on broad scale extension in the Ethiopian Highlands and Main Ethiopian Rift[J]. Geophysical Research Letters,2016-01-01,43(13).