f The Seismic Roots of the West African Passive Margin: Northern Cameroon to Southern Gabon

To improve our understanding of the the rift-todrift history of Atlantic passive margins, nearly 10,000 km of deep-imaging seismic data were acquired off West Africa as part of the PROBE Study. The study region extends from 4 N to 4 S and includes both the shelf areas and the adjacent oceanic crust. Acquisition parameters were specifically selected to maximize imaging of the sub-basement seismic architecture. Most of the data were shot using a 7600 cu. in. airgun array and 7100 m-Iong cable array. As much as possible, two sub-sets of crossing line orientations were used; one sub-set was shot sub-parallel to inferred flow-lines, the other sub-parallel to inferred isochrons. Ongoing data processing and reprocessing have focused on optimizing deep structure, particularly reflection Moho configuration. The geological story emerging from the PROBE Study is still incomplete, but compelling nonetheless.