National Gravity Compilation 2019: Tilt-Filtered Gravity Anomaly Grid for Australia

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented with offshore data, were used to generate this grid. The data, acquired from the 1940s to September 2019, were processed with terrain corrections and a tilt filter to produce a spherical cap Bouguer anomaly image. Geoscience Australia quality-checked the final data, which has a cell size of approximately 435 meters.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Supporting mineral and resource exploration by revealing density variations in the crust.
• Integrating with other geophysical datasets for continental-scale geological studies.
• Calibrating or validating satellite-derived gravity measurements with ground observations.

Strengths

• Derived from nearly 1.4 million quality-controlled gravity stations.
• Integrates decades of data from government, industry, and academia, collected from the 1940s to 2019.
• Applies terrain corrections using both offshore bathymetry and onshore topography.
• Has a defined spatial resolution with a grid cell size of approximately 435 meters.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data freshness should be verified as the underlying observations are current only to September 2019.

Provenance

Source

Geoscience Australia Data, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and Scripps Institution of Oceanography.

Collection Method

Ground and offshore gravity observations processed with standard methods, terrain corrections, and a tilt filter.

Time Range

1940s to September 2019

Freshness

Last updated 2026-04-30 13:38:43.418253; underlying observations current to September 2019.

Geography

Australia and its continental margins