Australian Continental Gravity Anomaly Grid 2019

Approximately 1.8 million gravity observations, including nearly 1.4 million land stations, underpin this 2019 compilation. The Australian Ocean Data Network processed and quality-checked these data, which combine ground surveys from the 1940s onward with offshore data from Scripps Institution of Oceanography. The resulting grid has a cell size of 0.00417 degrees (about 435 meters) and shows complete Bouguer anomalies over Australia and its margins.

Use Cases

• Map geological structures by interpreting the complete Bouguer anomaly values across the 435m grid.
• Model subsurface density contrasts for mineral exploration using the terrain-corrected gravity units.
• Integrate offshore bathymetry and onshore topography data with the gravity anomaly grid for continental margin studies.

Strengths

• Derived from nearly 1.4 million gravity stations in the Australian National Gravity Database.
• Combines decades of ground data (1940s-present) with a major global offshore gravity grid.
• Station spacing in major parts of the continent is between 2.5 and 7 km, providing regional detail.

Limitations

• The underlying observation data and specific column schema for the grid are not provided.
• Data freshness is unclear as the grid is derived from a 2019 snapshot of the national database.
• Airborne survey line spacing varies from 0.5 km to 2.5 km, indicating inconsistent resolution in some areas.

Provenance

Source

Australian National Gravity Database and v28.1 of the Global Gravity grid from Scripps Institution of Oceanography/NOAA/NGA.

Collection Method

Ground and airborne gravity surveys processed via standard methods, checked by GA geophysicists, and gridded.

Time Range

1940s to September 2019.

Freshness

null

Geography

Australia and its continental margins.