New multichannel seismic data from Bransfield Strait, West Antarctica, image complex fan-shaped faulting patterns along the Antarctic Peninsula margin. Although a neovolcanic zone running along the strait's axis has been presumed to be a nascent spreading center and the primary focus for extension, the fan- shaped faulting pattern can be interpreted instead as evidence for intracrustal diapirism, suggesting separate, diffuse zones of extension. Further-more, the diapiric trend ∼5° divergent from that of the neovolcanic zone supports temporal and spatial evolution of stress, perhaps in response to complex plate interactions to the northeast.

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