Investigation Of The Upper Crust In The Central Main Ethiopian Rift Using Gravity Method

The Main Ethiopian Rift (MER) connects the Afar depression, in the north, and the Kenyan rift in the south. It is divided geographically into three sectors: the northern, central and southern sectors. In this project a possible density model for the upper crust of the central MER is presented using gravity data collected by the Ethiopian Institute of Geological surveys (EIGS). The gravity data are tied to the International Gravity Standardization Net, 1971 (IGSN 71) and all standard corrections including the terrain correction are performed. The model, constrained by geophysical and geological data, reveals the presence of the Mesozoic sequence lying between the Cenozoic volcanic rocks and the Precambrian basement rocks. Moreover, combined filtering and horizontal gradient methods performed on the complete Bouguer gravity anomaly have outlined the rim of a large caldera buried under the central sector of the MER.

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