Magma-maintained rift segmentation at continental rupture in the 2005 Afar dyking episode

@article{Wright2006MagmamaintainedRS,
  title={Magma-maintained rift segmentation at continental rupture in the 2005 Afar dyking episode},
  author={T. Wright and C. Ebinger and J. Biggs and A. Ayele and G. Yirgu and D. Keir and A. Stork},
  journal={Nature},
  year={2006},
  volume={442},
  pages={291-294}
}
Seafloor spreading centres show a regular along-axis segmentation thought to be produced by a segmented magma supply in the passively upwelling mantle. On the other hand, continental rifts are segmented by large offset normal faults, and many lack magmatism. It is unclear how, when and where the ubiquitous segmented melt zones are emplaced during the continental rupture process. Between 14 September and 4 October 2005, 163 earthquakes (magnitudes greater than 3.9) and a volcanic eruption… Expand
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References

SHOWING 1-10 OF 37 REFERENCES
Strain accommodation by magmatism and faulting as rifting proceeds to breakup: Seismicity of the northern Ethiopian rift
[1] The volcanically active Main Ethiopian rift (MER) marks the transition from continental rifting in the East African rift to incipient seafloor spreading in Afar. We use new seismicity data toExpand
Variations in the along‐axis segmentation of the Afar Rift system
Both oceanic and continental rifts show regular along-axis segmentation, but the relationship, if any, between the two is poorly understood. The tectonically active East African Rift systemExpand
The Afar Volcanic Province Within The East African Rift System
The seismically and volcanically active East African Rift System is an ideal laboratory for continental break-up processes: it encompasses all stages of rift development. Its northernmost sectorsExpand
Numerical modelling of quaternary deformation and post-rifting displacement in the Asal-Ghoubbet rift (Djibouti, Africa)
Over the last three decades a host of information on rifting process relating to the geological and thermal structure, long-time scale deformation (Quaternary and Holocene) and rifting cycleExpand
InSAR based sill model links spatially offset areas of deformation and seismicity for the 1994 unrest episode at Eyjafjallajökull volcano, Iceland
[1] We present InSAR observations of deformation due to an intrusion in the Eyjafjallajokull volcano, Southern Iceland, in 1994. More than 15 cm of deformation in the line of sight (LOS) direction isExpand
Volcanism of Afar: Small-scale plate tectonics implications
Structures analogous to oceanic spreading ridges, transform faults, and “leaky” fracture zones have been identified in Afar. They were formed during the past 3 to 4 m.y. and permit identification ofExpand
A mechanism for magmatic accretion under spreading centres
The most active volcanic zone on Earth occurs along the global mid-ocean ridge system where the lithosphere is pulled apart and new oceanic crust is created at rates between 10 and 200 km Myr−1. ThisExpand
Post-rifting stress relaxation at the divergent plate boundary in Northeast Iceland
INTERACTION of the elastic lithosphere with the underlying anelastic asthenosphere causes strain to propagate along the Earth's surface in a diffusion-like manner following tectonism at plateExpand
The Afar Depression: interpretation of the 1960–2000 earthquakes
SUMMARY We studied the seismic activity of the Afar Depression (AD) and adjacent regions during the period 1960‐2000. We define seven distinct seismogenic regions using geological, tectonic andExpand
Triple junction and ridge hotspots: Earthquakes, faults, and volcanism in Afar, the Azores, and Iceland
The Afar depression of the Horn of Africa, the Azores Archipelago, and Iceland are zones of plate divergence and mantle plume discharge. Strike-slip focal mechanisms dominate in major earthquakes.Expand
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