AUSTREA-2: Seafloor Mapping Survey of South-east Tasmania and Macquarie Ridge
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Description
140,000 km² of seabed was mapped during a 25-day survey in January/February 2000 by the Australian Geological Survey Organisation (AGSO). The AUSTREA-2 cruise collected swath bathymetry, seismic, sub-bottom, gravity, magnetic, and oceanographic data to support continental shelf definition and marine resource assessment. Data quality was reported as generally excellent despite occasional rough weather.
Use Cases
Define the legal continental shelf foot-of-slope based on high-resolution bathymetric mapping.
Assess seabed living and non-living resources for marine zone planning based on geophysical and oceanographic profiles.
Analyze tectonic fabric and seafloor features like seamounts and trenches described in the survey report.
Model oceanographic conditions using collected seawater temperature, salinity, and current depth profiles.
Strengths
Mapped approximately 140,000 km² of seabed over a 10,200 km survey track.
Collected a multi-instrument suite including swath bathymetry, seismic, sub-bottom profiling, gravity, magnetics, and oceanographic data.
Data quality was described as generally excellent, acquired under highly favourable weather conditions for most of the survey.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Data is stored in PDF and HTML report formats, which may require extraction for computational analysis.
Last updated 2026-04-10 17:51:53.790907; freshness should be verified as the underlying survey is from 2000.
Provenance
Source
Australian Geological Survey Organisation (AGSO), National Oceans Office, Environment Australia.
Collection Method
Ship-based survey using the N/O L'Atalante research vessel, employing Simrad EM12D swath systems, GI-gun seismic, 3.5 kHz profiler, and oceanographic sensors.
Time Range
January to February 2000.
Freshness
Survey conducted in 2000; metadata last updated in 2026.
Geography
South and south-east Tasmania, south of Macquarie Island, Southern Macquarie Ridge Complex.
Primary data formats are PDF and HTML reports; raw digital data formats are not specified and may require contacting the custodians (AGSO/National Oceans Office).