Bremer Sub-basin Seismic Survey Data for Crustal and Basement Analysis

Geoscience Australia conducted the Southwest Frontiers Survey in late 2004, acquiring 2700 km of industry-standard seismic data. The survey aimed to define basement composition and crustal thickness to constrain the tectonic evolution of the region. Refraction data indicated sediment thickness exceeding 9 km and basement velocities of 5.2-5.6 km/s, suggesting a non-granitic composition.

Use Cases

• Improve depth conversion of reflection seismic data based on accurate seismic velocity information.
• Model hydrocarbon maturation scenarios based on basement composition and heat production differences.
• Constrain tectonic evolution interpretations using estimates of crustal thickness under sediment deposition centers.
• Compare continental margin structures using conjugate data from the Australian and Antarctic margins.

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 supplemented prior coverage from old sonobuoy and onshore station data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-05-14 09:35:55.943389; 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

Survey conducted in late 2004.

Freshness

Last updated 2026-05-14 09:35:55.943389

Geography

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