Geophysical measurements were carried out in the Western Margin of the Antarctic Peninsula and Bransfield<br>Strait by the Brazilian Antarctic Program during the summers of 1987 and 1988. The present work, using a<br>continued seismic multi channel and magnetometry data profile crossing the area, intends to present a twodimensional<br>model of the interface sediment/basement and contribute to the understanding of the complex<br>geology verified in the studying area. By this model, the main provinces of the area (Deep Ocean, South<br>Shetland Trench, Accretionary Prism, Volcanic Arc South Shetland Islands and Bransfield Basin) could be<br>determined. The seismic and magnetic measurements information when superposed can attribute more<br>consistencies to the interpreted basement; although each method has its particular resolution. This way, when<br>the seismic interpretation was not possible due to complex structures disposition, magnetic measurements<br>could offer good estimation about basement depth. The fit between both methods (seismic and magnetic<br>measurements) was reasonable both on the oceanic basin and in the region of Bransfield Strait. The<br>magnetometry, as well as seismic, was sensible to the dip of Drake Plate at South Shetland Trench and the<br>intrusive occurrence at Bransfield Basin axis.


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