Velocity Structure Of The Upper Crust Across The Main Ethiopian Rift

Refraction t~e is one of the geophysical investigation methods used 10 map the subsurfacernlayers based upon the velocity variation of the seismic wave as it propagates through differentrngeological materials.rnAs a part of the Ethiopia Afar Geoscientfic Lithospheric Experiment (EAGLE) project conductedrnin January 200 the detail study of the crustal seismic P-waves has been carried out to producernthe seismic model down to the depth of 10 la)1 ·from Chefodonsa (E5 13296, N99264 10 to Kularn(E575823, N886441) for about 120Km profile length across the Main Ethiopian Rift.rnFive shot points with inter shot separation of about 46Km were used as seismic source and therndata were recorded on 120 geophones deployed in the study area at I km spacing.rnThe first arrival times were picked, processed and inverted using the generalized reciprocalrnmethod (ORM); and gave the four major seismic layers up to the depth of 10 km across the rift.rnThere is a steady increase in P-wave veloc ity from about 3000mls in the first layer to aboutrn6365m1s in the last layer. Lateral Velocity vari ations are also observed in the layers ..rnAttempts have been made to correlate the seismic layers with the known geological fonnations.rnBoarder faults and other major faults have been clearly identified.

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