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

Nearly 1.4 million gravity stations from the Australian National Gravity Database, supplemented by offshore data, were used to generate this 2019 grid. The grid has a cell size of 0.00417 degrees (approximately 435m) and shows de-trended global isostatic residual anomalies over Australia and its continental margins. Data were acquired by government, industry, and research organizations from the 1940s onward and processed by Geoscience Australia.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Identifying density contrasts in the Earth's crust for mineral exploration based on gravity measurements.
• Integrating gravity data with other geophysical surveys for regional geological interpretation.
• Studying isostatic compensation and crustal thickness based on de-trended global isostatic residual anomalies.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Station spacing for ground observations varies from 11 km down to less than 1 km, with major parts of the continent between 2.5 and 7 km.
• Data quality was checked by GA geophysicists to ensure it is fit-for-purpose.
• Incorporates data from the 1940s to 2019, offering a long historical record.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

Australian Ocean Data Network, incorporating data from Geoscience Australia's National Gravity Database and Scripps Institution of Oceanography.

Collection Method

Ground and marine gravity observations processed via standard methods to produce a de-trended global isostatic residual grid.

Time Range

1940s to September 2019

Freshness

Last updated 2026-06-27 20:01:45.510823; freshness should be verified.

Geography

Australia and its continental margins