Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by marine data, were used to generate this 2019 grid. Geoscience Australia processed ground observations collected from the 1940s onward by government, industry, and research bodies. The image represents the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its continental margins at a cell size of approximately 435 meters.
Use Cases
- Map subsurface geological structures based on gravity anomaly data.
- Interpret density variations in the Earth's crust for mineral exploration.
- Integrate gravity data with other geophysical surveys for regional geological modeling.
- Study continental margin structures using combined terrestrial and marine gravity observations.
Strengths
- Integrates nearly 1.4 million gravity stations from a national database.
- Combines ground data collected from the 1940s to present with v28.1 of the Global Gravity grid.
- Data quality was checked by GA geophysicists to ensure fitness for purpose.
- Station spacing in major parts of the continent is between 2.5 and 7 kilometers.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Description metadata is limited; actual data quality requires manual inspection after download.
Provenance
- Source
- Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and Scripps Institution of Oceanography/NOAA/NGA.
- Collection Method
- Ground and marine gravity observations processed via standard methods, including isostatic correction and Fast Fourier Transform (FFT).
- Time Range
- Ground data collected from the 1940s to September 2019.
- Freshness
- Last updated 2026-05-14 03:42:48.817827; freshness should be verified.
- Geography
- Australia and its continental margins.