National Gravity Compilation 2019: Complete Bouguer Anomalies Over Australia

A gravity anomaly image derived from nearly 1.4 million ground stations and marine data, representing subsurface rock density variations across Australia and its continental margins. The grid has a cell size of approximately 435 meters and is given in gravity units (um/s^2). Data were compiled by Geoscience Australia from government, industry, and research sources, with observations dating from the 1940s to September 2019.

Use Cases

• Modeling geological structures based on gravity anomaly patterns.
• Integrating gravity data with other geophysical surveys for mineral exploration.
• Studying continental margin geology based on combined onshore and offshore data.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Station spacing varies from 11 km to less than 1 km, with major parts of the continent between 2.5 and 7 km.
• Incorporates data from multiple sources (Commonwealth, State, industry, universities) collected from the 1940s onward.

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 Data, supplemented by Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

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

Time Range

1940s to September 2019.

Freshness

Last updated 2026-04-30 13:45:02.394299; freshness should be verified.

Geography

Australia and its continental margins.