期刊
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
卷 117, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2011JB008516
关键词
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资金
- NSF [EAR 0635696, EAR 0635702]
- UNAVCO
- Directorate For Geosciences
- Division Of Earth Sciences [0947969] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1119209, 0838488] Funding Source: National Science Foundation
GPS observations along three profiles across the Ethiopian Rift and Afar triple junction record differences in the length scale over which extension is accommodated. In the Afar region, where the mantle lithosphere is nearly or entirely absent, measurable extension occurs over similar to 175 km; in the northern Ethiopian Rift, where the mantle lithosphere is anomalously thin and hot, extensional strain occurs over similar to 85 km, extending beyond the structural rift valley; in the southern Ethiopian Rift, where the mantle lithosphere approaches standard continental thickness, extensional strain occurs over <10 km. This trend of increasingly distributed deformation contrasts with the standard model where continental rifts become mid-ocean spreading centers through strain localization.
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