National Gravity Compilation 2019: Australian Subsurface Bouguer Anomaly Grid

Approximately 1.4 million gravity stations from the Australian National Gravity Database were used to generate this spherical cap Bouguer anomaly grid. The data, processed by GA geophysicists and supplemented with offshore global data, measures subsurface rock density variations with a cell size of 0.00417 degrees (approximately 435m). This 2019 compilation from the Australian Ocean Data Network is provided in gravity units (um/s^2).

Use Cases

• Model subsurface geological structure based on gravity anomaly data.
• Interpret rock density variations for mineral or hydrocarbon exploration.
• Integrate gravity data with other geophysical surveys for regional geological analysis.
• Calibrate or validate satellite-derived gravity measurements with ground observations.

Strengths

• Derived from nearly 1.4 million quality-checked ground gravity stations.
• Grid cell size of 0.00417 degrees (approximately 435m) provides regional detail.
• Data processing followed standard methods to isolate the geological signal.
• Supplemented with v28.1 of the Global Gravity grid for offshore coverage.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Freshness should be verified as the underlying observations are from September 2019.

Provenance

Source

Australian National Gravity Database (ANGD) and Global Gravity grid from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

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

Time Range

Observations as of September 2019.

Freshness

Last updated 2026-04-10 20:19:36.207594

Geography

Australia and surrounding offshore regions.