Australian Gravity Anomaly Grid with Airborne Data, 2019 Compilation

Approximately 1.8 million gravity observations, including nearly 1.4 million ground stations and 451,000 line kilometers of airborne surveys, were used to create this tilt-filtered Bouguer anomaly grid. The data were compiled by Geoscience Australia and partners, integrating ground, airborne, and offshore measurements collected from the 1940s to 2019. The resulting grid has a cell size of approximately 435 meters and covers Australia and its continental margins.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly patterns.
• Enhancing mineral exploration targeting by interpreting density contrasts in the crust.
• Integrating gravity data with other geophysical datasets for regional tectonic studies.
• Calibrating and validating satellite-derived gravity measurements over continental landmasses.

Strengths

• Integrates multiple data sources: 1.4 million ground stations, 345,000 line km of airborne gravity, and 106,000 line km of airborne gradiometry.
• Includes terrain corrections calculated using both offshore bathymetry and onshore topography.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Station spacing varies from 11 km to less than 1 km, with major areas between 2.5 and 7 km.

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 surveys from the 1940s onward.

Provenance

Source

Geoscience Australia (GA), Australian Ocean Data Network, supplemented with data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Processed from the Australian National Gravity Database and global grids, incorporating ground, airborne, and offshore gravity measurements.

Time Range

1940s to 2019 (with compilation date of September 2019).

Freshness

Last updated 2026-04-10 17:13:28.305230; freshness should be verified.

Geography

Australia and its continental margins.