Australia and its continental margins are covered by a gravity anomaly grid derived from approximately 1.8 million ground and airborne gravity observations. The grid, with a cell size of 0.00417 degrees (~435m), was compiled by Geoscience Australia and other organizations using data from the 1940s to 2019. It includes a half vertical derivative of complete Bouguer anomalies to reveal subsurface geological structure.
Use Cases
- Map subsurface geological structures based on gravity anomaly data.
- Identify potential mineral deposits based on density variations in the Earth's crust.
- Integrate gravity data with other geophysical surveys for regional geological modeling.
- Calculate terrain corrections for gravity surveys using referenced bathymetry and topography data.
Strengths
- Derived from approximately 1.8 million gravity observations, including nearly 1.4 million ground stations.
- Incorporates 345,000 line km of airborne gravity and 106,000 line km of airborne gravity gradiometry data for improved resolution.
- Station spacing varies from 11 km to less than 1 km, with major parts of the continent between 2.5 and 7 km.
- Terrain corrections were calculated using both offshore bathymetry and onshore topography 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 2026-05-05 01:30:54.705850; freshness should be verified.
Provenance
- Source
- Australian Ocean Data Network, Geoscience Australia, Commonwealth, State and Territory Governments, mining industry, universities, and research organisations.
- Collection Method
- Ground and airborne gravity data acquisition and processing via standard methods, supplemented by global gravity grids.
- Time Range
- 1940s to 2019
- Geography
- Australia and its continental margins