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Structure of the southern New South Wales continental margin, south-eastern Australia

Created 16/10/2025

Updated 16/10/2025

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High-quality, regional seismic data collected on the continental margin of southern New South Wales indicate that the margin lacks major basin development, consistent with its interpretation as an upper plate margin. The most striking structural feature is a mid-slope graben or half graben which is bounded on its eastern (seaward) side by a westerly-dipping fault system and a basement ridge. The half-graben contains up to 2.2 seconds TWT (~2500 m) of sediment, including syn-rift deposits possibly as old as Late Jurassic. A seaward-thickening wedge of sediment overlies a generally flat basement surface beneath the shelf. This contrasts with large areas of the lower continental slope which are essentially free of sediment. Sediment thicknesses beneath the Tasman Sea abyssal plain reflect basement structure. The greatest thickness occurs next to the foot of the slope where sediment loading has produced flexuring in either oceanic or thinned-continental crust. Overall, the petroleum potential of the margin (excluding the pre-rift Sydney Basin rocks) appears to be low.

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Additional Info

Field Value
Title Structure of the southern New South Wales continental margin, south-eastern Australia
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/8ac440ba-bf5c-4250-bcd6-302f25fb6203
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 20/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        148.0,
        -40.0
      ],
      [
        164.0,
        -40.0
      ],
      [
        164.0,
        -30.5
      ],
      [
        148.0,
        -30.5
      ],
      [
        148.0,
        -40.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Structure of the southern New South Wales continental margin, south-eastern Australia". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/structure-of-the-southern-new-south-wales-continental-margin-south-eastern-australia