National Gravity Compilation 2019: Australian Gravity Anomaly Grid

Australia and its continental margins are covered by this gravity anomaly grid derived from approximately 1.8 million ground and airborne observations. The grid has a cell size of approximately 435 meters and shows complete Bouguer anomalies. It was compiled by Geoscience Australia using data from government, industry, and research sources dating from the 1940s to 2019.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Interpret density variations in the Earth's crust for mineral exploration.
• Integrate gravity data with other geophysical surveys for regional geological studies.
• Analyze terrain-corrected Bouguer anomalies for tectonic feature identification.

Strengths

• Derived from approximately 1.8 million gravity observations, including nearly 1.4 million ground stations.
• Incorporates 345,000 line km of Airborne Gravity and 106,000 line km of Airborne Gravity Gradiometry data.
• Station spacing varies from 11 km down to less than 1 km, with major parts of the continent between 2.5 and 7 km.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Last updated 2026-06-27 20:54:48.591236; freshness should be verified.

Provenance

Source

Australian National Gravity Database (ANGD), supplemented by global gravity grids from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and airborne gravity surveys processed via standard methods and quality-checked by GA geophysicists.

Time Range

1940s to 2019

Freshness

Data reflects observations as of September 2019.

Geography

Australia and its continental margins