National Gravity Compilation 2019 DGIR Grid: De-trended Gravity Anomalies Over Australia

A gravity anomaly grid for Australia and its continental margins derived from nearly 1.4 million ground and marine gravity stations. The data, processed to show de-trended global isostatic residual anomalies, have a cell size of 0.00417 degrees (approximately 435m) and are provided in gravity units (um/s^2). The compilation integrates ground observations from the Australian National Gravity Database as of September 2019 with offshore data from a global gravity grid.

Use Cases

• Model subsurface geological structures based on gravity anomaly patterns.
• Support mineral and resource exploration by identifying density contrasts in the crust.
• Study continental margin tectonics and isostatic compensation using de-trended residual anomalies.
• Integrate gravity data with other geophysical datasets for regional geological interpretation.

Strengths

• Integrates nearly 1.4 million gravity stations from a national database and global marine sources.
• Data quality is checked by GA geophysicists to ensure fitness-for-purpose.
• Ground observations have a station spacing ranging from less than 1 km to 11 km, with major parts between 2.5 and 7 km.
• Combines data collected from the 1940s to the present day from government, industry, and academic sources.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for some analytical methods.
• Freshness should be verified as the underlying gravity database snapshot is from September 2019.

Provenance

Source

Australian Ocean Data Network, incorporating data from the Australian National Gravity Database and the Scripps Institution of Oceanography/NOAA/NGA Global Gravity grid.

Collection Method

Processed from ground and marine gravity observations via standard methods, applying isostatic and trend corrections to Complete Bouguer Anomaly data.

Time Range

Ground observations collected from the 1940s to present; compilation snapshot as of September 2019.

Freshness

Last updated 2026-06-23 01:28:37.189558; underlying data snapshot from September 2019.

Geography

Australia and its continental margins.