We are very grateful to REPSOL and TGS-NOPEC for allowing us to use a large unpublished data set of seismic records and well results from the Gulf of Cádiz and west off Portugal. We record our special thanks to Hugo Matias (REPSOL, Spain) for his work and time to help us best utilize these REPSOL geophysical and well data. We also thank the Spanish Hydrographic Institute (Cádiz, Spain), the Portuguese Hydrographic Institute (Lisbon, Portugal), and the TELEFONICA Company for sending us information related to the location of submarine cables, a former explosives dumping grounds, and other matters. We further thank Dr. R. León and Dr. E. Llave (Geological Survey, IGME, Spain) for their help to elaborate the annotated navigation maps, as well as R. Brackenridge (Heriot Watt University, Edinburgh, United Kingdom) for her detailed standard sedimentological analysis carried out for the site locations and surrounding areas. The Spanish "Comisión Interministerial de Ciencia y Tecnología" supports in part this research work through Project CTM 2008-06399-C04/MAR (CONTOURIBER).