National Gravity Compilation 2019: Tilt Image of Australian Subsurface

A gravity anomaly grid derived from approximately 1.8 million ground and offshore gravity observations. The data were compiled by Geoscience Australia and other government, industry, and research organizations, with observations dating from the 1940s to 2019. The final tilt image has a cell size of 0.00417 degrees (approximately 435 meters) and covers Australia and its continental margins.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Mineral and resource exploration targeting based on density variations in the crust.
• Integrating gravity data with other geophysical surveys for regional geological studies.
• Academic research into the tectonic and geological history of the Australian continent.

Strengths

• Derived from nearly 1.4 million gravity stations from the Australian National Gravity Database.
• Station spacing varies from 11 km down to less than 1 km, with major parts of the continent between 2.5 and 7 km.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates offshore data from a global gravity grid developed by Scripps, NOAA, and NGA.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-06-27 19:38:26.332235; freshness should be verified.

Provenance

Source

Geoscience Australia (GA), Australian Ocean Data Network, Commonwealth/State/Territory Governments, mining industry, universities.

Collection Method

Ground gravity observations processed with terrain corrections and a tilt filter applied to a spherical cap Bouguer anomaly grid.

Time Range

1940s to 2019

Freshness

Data reflects observations as of September 2019; metadata was last updated in 2026.

Geography

Australia and its continental margins