Western Australia Bouguer And Free-Air Gravity Anomaly Grid

Western Australia gravity data combines onshore Bouguer anomalies with offshore Free-air anomalies. The grid merges ground data from the Australian National Gravity Database with 23 airborne surveys and satellite-derived marine gravity.

Use Cases

• Model subsurface density structures using the combined Bouguer and Free-air anomaly grid.
• Analyze terrain-corrected gravity data from the Australian National Gravity Database for geological mapping.
• Integrate 23 airborne vertical gravity and gradiometer surveys for regional geophysical interpretation.
• Compare offshore Ellipsoidal Free-air anomalies derived from satellite altimetry with onshore data.

Strengths

• Integrates 23 distinct airborne gravity and gradiometer surveys.
• Combines multiple data sources: ground, airborne, and satellite-derived marine gravity.
• Data is corrected for terrain effects over the continental region.

Limitations

• Specific row/column counts and spatial resolution are not provided.
• Offshore data is based on older satellite gravity models (V16.1) and topography (V9.1).
• The visual representation uses a specific pseudo colour ramp and relief shading, which may not suit all analyses.

Provenance

Source

Department of Energy, Mines, Industry Regulation and Safety (Chief Geophysicist).

Collection Method

Ground data extracted from the Australian National Gravity Database, merged with 23 airborne surveys and satellite altimetry data.

Time Range

2020 (grid version).

Freshness

Grid version is from 2020; metadata was last updated in March 2026.

Geography

Western Australia, including onshore continental region and offshore areas.