Crustal thinning between the Ethiopian and East African plateaus from modeling Rayleigh wave dispersion

Margaret H. Benoit; Andrew A. Nyblade; Michael E. Pasyanos

doi:10.1029/2006GL025687

Crustal thinning between the Ethiopian and East African plateaus from modeling Rayleigh wave dispersion

Margaret H. Benoit, Andrew A. Nyblade, Michael E. Pasyanos

Geosciences

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46 Scopus citations

Abstract

A 500-km wide region separating the East African and Ethiopian plateaus is one of the few places within the African Superswell with elevations below 1 km. The region encompasses much of southeastern Sudan and northern Kenya and experienced both Mesozoic and Cenozoic rifting. Crustal and uppermost mantle structure is investigated in the region by modeling Rayleigh wave dispersion measurements. Modeling results give Sn velocities of 4.1-4.3 km/s and average crustal thickness of 25 ±5 km, some 10-15 km thinner than the crust beneath the East African and Ethiopian Plateaus. The isostatic response from 10 to 15 km of crustal thinning is sufficient to account for the low elevations between the plateaus.

Original language	English (US)
Article number	L13301
Journal	Geophysical Research Letters
Volume	33
Issue number	13
DOIs	https://doi.org/10.1029/2006GL025687
State	Published - Jul 2006

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/2006GL025687

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title = "Crustal thinning between the Ethiopian and East African plateaus from modeling Rayleigh wave dispersion",

abstract = "A 500-km wide region separating the East African and Ethiopian plateaus is one of the few places within the African Superswell with elevations below 1 km. The region encompasses much of southeastern Sudan and northern Kenya and experienced both Mesozoic and Cenozoic rifting. Crustal and uppermost mantle structure is investigated in the region by modeling Rayleigh wave dispersion measurements. Modeling results give Sn velocities of 4.1-4.3 km/s and average crustal thickness of 25 ±5 km, some 10-15 km thinner than the crust beneath the East African and Ethiopian Plateaus. The isostatic response from 10 to 15 km of crustal thinning is sufficient to account for the low elevations between the plateaus.",

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year = "2006",

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T1 - Crustal thinning between the Ethiopian and East African plateaus from modeling Rayleigh wave dispersion

AU - Benoit, Margaret H.

AU - Nyblade, Andrew A.

AU - Pasyanos, Michael E.

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Y1 - 2006/7

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AB - A 500-km wide region separating the East African and Ethiopian plateaus is one of the few places within the African Superswell with elevations below 1 km. The region encompasses much of southeastern Sudan and northern Kenya and experienced both Mesozoic and Cenozoic rifting. Crustal and uppermost mantle structure is investigated in the region by modeling Rayleigh wave dispersion measurements. Modeling results give Sn velocities of 4.1-4.3 km/s and average crustal thickness of 25 ±5 km, some 10-15 km thinner than the crust beneath the East African and Ethiopian Plateaus. The isostatic response from 10 to 15 km of crustal thinning is sufficient to account for the low elevations between the plateaus.

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Crustal thinning between the Ethiopian and East African plateaus from modeling Rayleigh wave dispersion

Abstract

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