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2700 km of industry-standard seismic data were acquired in late 2004 as part of Geoscience Australia's Southwest Frontiers Survey. The refraction study revealed basement velocities of 5.2-5.6 km/s, indicating a non-granitic composition, and identified sediment thickness exceeding 9 km in the Bremer Sub-basin. Results were correlated with findings from the 50th Russian Antarctic Expedition, suggesting a ~400km wide low-velocity zone in the pre-breakup Gondwana crust.
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