National Gravity Compilation 2019 DGIR Grid: Australian Subsurface Anomalies

Australia and its continental margins are covered by this grid of de-trended global isostatic residual gravity anomalies. The grid is derived from nearly 1.4 million gravity stations from the Australian National Gravity Database and offshore data, with ground observations collected from the 1940s to 2019. Geoscience Australia produced this 2019 compilation, which has a cell size of approximately 435 meters and data in units of micro-meters per second squared.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Mapping density variations in the Earth's crust for mineral exploration.
• Integrating gravity data with other geophysical surveys for regional geological studies.

Strengths

• Derived from nearly 1.4 million gravity stations, indicating a substantial observational base.
• Ground data collection spans from the 1940s to 2019, providing a long temporal baseline.
• Station spacing in major parts of the continent is between 2.5 and 7 km, suggesting detailed regional coverage.

Limitations

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

Provenance

Source

Geoscience Australia Data, supplemented by offshore data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Processed from ground observations in the Australian National Gravity Database and a global marine gravity grid.

Time Range

Ground observations from the 1940s to September 2019.

Freshness

Last updated 2026-04-20 01:51:02.335466; freshness should be verified.

Geography

Australia and its continental margins.