National Gravity Compilation 2019: Complete Bouguer Anomaly Image of Australia

Australia and its continental margins are covered by this gravity anomaly image derived from approximately 1.8 million ground and marine observations. The grid has a cell size of 0.00417 degrees (approximately 435m) and data are in gravity units (um/s^2). It was compiled by Geoscience Australia using data from the 1940s to September 2019, supplemented by global offshore data.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Interpret density variations in the Earth's crust for mineral exploration.
• Integrate gravity data with other geophysical surveys for comprehensive geological mapping.
• Calculate terrain corrections for gravity surveys using the described bathymetry and topography data.

Strengths

• Derived from nearly 1.4 million gravity stations in the Australian National Gravity Database.
• Incorporates data collected from the 1940s to 2019, providing a long-term historical record.
• Station spacing varies from 11 km to less than 1 km, with major parts of the continent covered at 2.5 to 7 km resolution.
• Processed and quality-checked by GA geophysicists to be fit-for-purpose.

Limitations

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

Provenance

Source

Geoscience Australia (GA), Australian Ocean Data Network, supplemented by Scripps Institution of Oceanography, NOAA, and NGA data.

Collection Method

Ground and airborne gravity surveys processed via standard methods, compiled into a grid.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-06-23 05:25:04.253338; freshness should be verified.

Geography

Australia and its continental margins.