Abstract
Mueller, S. and Bonjer, K.-P., 1973. Average structure of the crust and upper mantle in East Africa. In: S. Mueller (Editor), The Structure of the Earth's Crust, based on Seismic Data. Tectonophysics , 20 (1–4): 283–293. An average crust-mantle model has been derived for the East African Rift system based on a number of presently available seismic data. The inversion of experimentally determined spectral transfer ratios of long-period body waves recorded at stations AAE (Addis Ababa, Ethiopia), NAI (Nairobi, Kenya) and LWI (Lwiro, Zaire) requires at least a two-layer crust. Except for station AAE, the observed P-wave delays can be accounted for by differences in the deduced crustal structure. Phase- and group-velocity measurements of Rayleigh waves along the path AAE-NAI provide additional information on the gross structure of the crust and upper mantle. Only a well-developed asthenosphere channel can explain the observed surface-wave dispersion. It is shown that the average model MS-71 permits a satisfactory interpretation of all the data presented in this paper.
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