National Gravity Compilation 2019: Half-Derivative Bouguer Anomaly Grid for Australia

A 2019 compilation of gravity data for Australia and its continental margins, derived from nearly 1.4 million ground stations and over 450,000 line km of airborne surveys. The grid, with a cell size of approximately 435 meters, shows the half vertical derivative of complete Bouguer anomalies. It was produced by Geoscience Australia using data from government, industry, and research sources dating from the 1940s onward.

Use Cases

• Modeling subsurface density structures based on gravity anomaly measurements.
• Integrating gravity data with other geophysical surveys for geological interpretation.
• Mapping continental margin geology based on offshore gravity data sourced from global grids.

Strengths

• Derived from a large volume of source data, including nearly 1.4 million ground gravity stations.
• Incorporates over 450,000 line kilometers of airborne gravity and gradiometry surveys.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station spacing varies from 11 km to less than 1 km, which may create resolution inconsistencies.

Provenance

Source

Geoscience Australia Data

Collection Method

Ground and airborne gravity observations processed via standard methods and FFT, supplemented by global offshore data.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-04-20 03:05:54.634888; freshness should be verified.

Geography

Australia and its continental margins.