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

Nearly 1.4 million gravity stations from a total of 1.8 million observations were used to create this continental-scale gravity grid. The Australian Ocean Data Network compiled this image from ground data collected since the 1940s and offshore data from Scripps Institution of Oceanography, NOAA, and NGA. It represents de-trended global isostatic residual anomalies with a cell size of approximately 435 meters.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Identify potential mineral exploration targets based on density variations in the crust.
• Integrate gravity data with other geophysical datasets for continental-scale geological mapping.
• Study isostatic compensation and tectonic processes based on the de-trended residual anomalies.

Strengths

• Incorporates nearly 1.4 million gravity stations from a national database spanning from the 1940s to 2019.
• Station spacing varies from 11 km to less than 1 km, with major parts of the continent covered at 2.5 to 7 km spacing.
• Combines ground observations from government, industry, and academia with offshore data from global institutions.

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 tasks.

Provenance

Source

Australian Ocean Data Network, compiling data from Commonwealth, State, Territory Governments, mining industry, universities, and Scripps Institution of Oceanography.

Collection Method

Grid generated from ground observations in the Australian National Gravity Database and offshore data from the Global Gravity grid.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-06-04 08:15:28.484576; freshness should be verified.

Geography

Australia and its continental margins.