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Seismic velocities in the North West Shelf Region, Australia, from near-vertical and wide-angle reflection and refraction studies

Created 17/10/2025

Updated 17/10/2025

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A significant limitation of conventional seismic reflection technology is that it poorly constrains seismic velocities in the deep part of the section. These velocities are needed for seismic migration, to convert from time to depth, and to estimate the likely rock composition at depth. Seismic observations at large offsets can compensate for this limitation. The Australian Geological Survey Organisation recorded high-quality refraction and wideangle reflection seismic data using ocean-bottom seismographs (OBS) along 5 profiles on Australia's North West Shelf, to maximum offsets of 300 km. The OBS transects coincide with previously acquired deep-crustal seismic-reflection profiles. Consequently, velocity information can now be derived from two independent data sets: common-depth point (near-vertical) reflection data and refraction/wide-angle reflection data.

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Title Seismic velocities in the North West Shelf Region, Australia, from near-vertical and wide-angle reflection and refraction studies
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/ff8b2e1a-ae55-4717-8999-08355fd03d9d
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        111.0,
        -21.0
      ],
      [
        130.0,
        -21.0
      ],
      [
        130.0,
        -10.0
      ],
      [
        111.0,
        -10.0
      ],
      [
        111.0,
        -21.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Seismic velocities in the North West Shelf Region, Australia, from near-vertical and wide-angle reflection and refraction studies". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/seismic-velocities-in-the-north-west-shelf-region-australia-from-near-vertical-and-wide-angle-r