Basement and crustal results from the Bremer Sub-basin, SW Australia and its Antarctic cou

A 2004 geophysical survey by Geoscience Australia acquired 2700 km of industry-standard seismic data along the south-western Australian continental margin. The dataset includes reflection and refraction data, with sonobuoy and land station recordings, aimed at defining basement composition and crustal thickness. Results indicate sediment thickness exceeding 9 km and basement velocities of 5.2-5.6 km/s, suggesting a non-granitic composition, with corroborating findings from a 2004-2005 Russian Antarctic Expedition.

Use Cases

• Improve depth conversion of reflection seismic data based on accurate seismic velocity information.
• Model tectonic evolution of the region based on estimates of crustal thickness underneath sediment deposition centers.
• Assess hydrocarbon maturation scenarios based on basement composition and its heat production characteristics.
• Correlate geological structures between conjugate margins based on low basement velocity data from Australia and Antarctica.

Strengths

• Includes 2700 km of 106-fold seismic data recorded to 12 seconds two-way time.
• Velocity data indicates a maximum sediment thickness in excess of 9 km.
• Refraction work supplements older coverage, providing new constraints on basement composition with velocities in the 5.2-5.6 km/s range.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-04-20 02:05:06.636576; freshness should be verified.

Provenance

Source

Geoscience Australia Data

Collection Method

Marine reflection and refraction seismic survey using a 6-8 km digital streamer and 4900 cui gun array, supplemented by sonobuoy and land station recordings.

Time Range

Late 2004 (survey), with Antarctic counterpart data from December 2004 - April 2005.

Freshness

Last updated 2026-04-20 02:05:06.636576

Geography

South-western Australian continental margin (Bremer Sub-basin) and its Antarctic conjugate counterpart.