National Gravity Compilation 2019: Complete Bouguer Anomalies Over Australia

2019 gravity anomaly grid derived from nearly 1.4 million ground stations and marine data, with observations collected from the 1940s to 2019. The image shows complete Bouguer anomalies over Australia and its continental margins at a cell size of approximately 435 meters. It was produced by Geoscience Australia from the Australian National Gravity Database and global offshore data.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Support mineral and resource exploration by mapping density variations in the crust.
• Integrate with other geophysical data for regional geological interpretation.
• Calculate terrain corrections for gravity surveys using the described bathymetry and topography data.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Integrates ground data collected from the 1940s onward with contemporary global marine data.
• Station spacing in major parts of the continent is between 2.5 and 7 km, indicating detailed sampling.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and temporal bias inherent to the aggregation of historical surveys.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and global sources.

Collection Method

Ground and airborne gravity surveys processed via standard methods, supplemented by the Scripps Institution of Oceanography's Global Gravity grid.

Time Range

1940s to 2019

Freshness

Last updated 2026-03-25 19:02:20.395562; freshness should be verified.

Geography

Australia and its continental margins