Australian Continental Gravity Anomaly Grid 2019

2019 data compiled from nearly 1.4 million gravity stations and marine data, spanning observations from the 1940s to September 2019. The grid shows the half vertical derivative of de-trended global isostatic residual anomalies over Australia and its margins. It was produced by Geoscience Australia from the Australian National Gravity Database and global marine sources.

Use Cases

• Map subsurface geological structures by interpreting the half vertical derivative of de-trended global isostatic residual anomalies.
• Model crustal thickness and density variations using the processed gravity anomaly values across the continent.
• Integrate with other geophysical data using the 0.00417-degree cell size grid for regional geological studies.

Strengths

• Derived from nearly 1.4 million gravity station observations.
• Combines ground data from 1940s-present with offshore global gravity data.
• Grid has a consistent cell size of approximately 435 meters (0.00417 degrees).

Limitations

• Station spacing is irregular, varying from 11 km to less than 1 km across the continent.
• Data compilation is static as of September 2019, lacking more recent observations.

Provenance

Source

Australian National Gravity Database and v28.1 of the Global Gravity grid from Scripps Institution of Oceanography/NOAA/NGA.

Collection Method

Ground and marine gravity observations processed via standard methods, with a fast Fourier transform applied to a de-trended global isostatic residual grid.

Time Range

1940s to September 2019.

Freshness

Compilation date is September 2019, though metadata was updated in April 2026.

Geography

Australia and its continental margins.