National Gravity Compilation 2019: Complete Bouguer Anomalies Over Australia

A 2019 compilation of gravity anomaly data for Australia and its continental margins, derived from approximately 1.8 million ground and airborne observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and is presented in units of micro-meters per second squared. Data was sourced from the Australian National Gravity Database and supplemented by global offshore data, with quality checks performed by Geoscience Australia geophysicists.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly measurements.
• Integrating gravity data with other geophysical surveys for mineral exploration.
• Studying continental margin geology using combined onshore and offshore gravity data.
• Calibrating regional geophysical models with terrain-corrected Bouguer anomalies.

Strengths

• Derived from a substantial base of nearly 1.4 million ground stations and over 450,000 line km of airborne surveys.
• Includes terrain corrections calculated using both offshore bathymetry and onshore topography data.
• Data quality was checked by Geoscience Australia geophysicists to ensure it is fit-for-purpose.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station and line spacing varies significantly across the continent, which may affect spatial resolution consistency.

Provenance

Source

Australian Ocean Data Network, aggregating data from Commonwealth, State, Territory Governments, industry, and research organizations.

Collection Method

Grid derived from ground observations in the Australian National Gravity Database and airborne gravity surveys, supplemented by the Scripps Institution of Oceanography's Global Gravity grid.

Time Range

Ground data collected from the 1940s to September 2019; compilation dated 2019.

Freshness

Last updated 2026-06-05 07:12:31.001410; freshness should be verified.

Geography

Australia and its continental margins.