Velocity Structure Of The Upper Crust Beneath The Northern Main Ethiopian Rift

Seismic and geologic sections are of the vital importance to the various professionalrnbodies, institutions and industries. They give us an insight on the grounds we are literallyrnstanding on. This study has conducted the surface imaging of the earth to a depth of 10rn~--:,----'~"---."'-rnkm on a 92.5 km long seismic profile line. The study was conducted starting from thernnorthern most of the Main Ethiopian Rift to the southern most of Afar to give us results,rnwhich are archetype to the study area.rnFor the generation of seismic waves explosives were detonated inside boreholes andrnprogrammable seismic energy recorders called "Texans" were j_epl()yed on the sutface atrnabout one kilometer spacing.rnReduced first arrival P-waves were picked and converted to actual time prior to inversion.rnThe geo-seismic model was inverted by the methods of Generalized Reciprocal Methodrn(GRM).rnFour layers at an avcrage depth of 2 km, 4.5 km, and 8.5 km were identified withrncorresponding average P-wav~ velocities of2875 mis, 4000 lnlS, 5700lnlS, and 6400 mlsrn~,-~----- ~--::-~ ~~-"-'-'-- .-----"-'--.,rnrespectively. The geological section of the studied area has been identified to rest on arnclystalline basement overlain by Meta-sediments and Meta-volcanic rocks. The first layerrnhas been identified as Miocene-qpaternary sediments; Cenozoic volcanic flows

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