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

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

Use Cases

• Model subsurface geological structures based on density variations inferred from gravity anomalies.
• Identify potential mineral and resource exploration targets based on gravity anomaly patterns.
• Integrate gravity data with other geophysical surveys (e.g., magnetic, seismic) for comprehensive geological interpretation.
• Study crustal architecture and isostatic compensation over the Australian continent and its margins.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Integrates ground data collected over decades (1940s to 2019) with v28.1 of the Global Gravity grid for offshore coverage.
• Processed and quality-checked by GA geophysicists to be fit-for-purpose, with specific corrections applied to the Complete Bouguer Anomaly data.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Station spacing for ground observations varies from 11 km to less than 1 km, which may create irregular resolution in some areas.

Provenance

Source

Australian Ocean Data Network, incorporating data from Commonwealth, State, Territory Governments, industry, universities, and research organisations.

Collection Method

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

Time Range

Observations from the 1940s to September 2019.

Freshness

Last updated 2026-04-28 15:42:51.608060; freshness should be verified.

Geography

Australia and its continental margins.