AUSTREA-2 Cruise Report: Seafloor Mapping South-East of Tasmania and Macquarie Ridge
Updated 1d ago
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Description
In January/February 2000, the Australian Geological Survey Organisation completed a 25-day seabed swath-mapping and geophysical survey. The survey covered about 10,200 km and mapped about 140,000 km² of seabed to support the definition of Australia's legal Continental Shelf and marine zone planning. Geophysical data included swath bathymetry, backscatter, seismic profiles, sub-bottom profiling, gravity, magnetic profiles, and oceanographic measurements.
Use Cases
Delineating the foot-of-slope for continental shelf claims based on high-resolution bathymetric data.
Assessing seabed resources (petroleum, minerals) using integrated geophysical and oceanographic profiles.
Studying marine geomorphology, such as slope canyons and seamount complexes, from swath-mapping coverage.
Analyzing tectonic fabric and seafloor spreading features on the southern Macquarie Ridge Complex.
Supporting marine spatial planning and environmental management with detailed seabed maps.
Strengths
Covers a substantial area of approximately 140,000 km² of seabed.
Integrates multiple geophysical data types (bathymetry, seismic, gravity, magnetic) with oceanographic measurements.
Data quality was reported as generally excellent despite occasional rough weather.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Data is from a single survey in early 2000; temporal coverage is limited.
Row count is unknown, which may limit suitability assessment.
Provenance
Source
Australian Ocean Data Network
Collection Method
Ship-based survey using the N/O L'Atalante research vessel, employing Simrad EM12D swath systems, GI-gun seismic, sub-bottom profilers, and oceanographic sensors.
Time Range
January to February 2000
Freshness
Last updated 2026-06-04 07:55:28.236380; freshness should be verified.
Geography
South and south-east Tasmania, south of Macquarie Island, and the Southern Macquarie Ridge Complex.
Primary file formats are PDF and HTML, which may require extraction or conversion for quantitative analysis.