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À. , L. Asfaw, and P. O. Box, Addis Ababa, Ethiopia. (observatory.aau@telecom.net.et) (vigny@geologie.ens.fr), ENS, 24 rue Lhomond. (ruegg@ipgp.jussieu.fr) K. L. Feiglfeigl@wisc.edu) P. Huchon, Laboratoire de Tectonique, p.6410, 1176.