National Gravity Compilation 2019: Complete Bouguer Anomaly Image of Australia

A 2019 compilation of gravity anomaly data for Australia and its continental margins, derived from nearly 1.4 million ground stations and marine observations. The grid has a cell size of approximately 435 meters, with data in units of micro-metres per second squared. It was produced by Geoscience Australia using observations from government, industry, and research sources dating from the 1940s to 2019.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Map continental crustal thickness and density variations based on Bouguer anomaly values.
• Integrate with other geophysical data for mineral and resource exploration based on the described station spacing and coverage.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Station spacing varies from 11 km down to less than 1 km, with major parts of the continent between 2.5 and 7 km.
• Incorporates data from the 1940s to 2019, offering a long historical record.
• Terrain corrections were applied using both offshore bathymetry and onshore topography data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Geoscience Australia (GA), supplemented by offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground and airborne gravity observations processed via standard methods and checked by GA geophysicists.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-04-10 22:04:55.084494; freshness should be verified.

Geography

Australia and its continental margins.