Enhanced Gravity and Magnetic Grids for Northern Australia

Geoscience Australia generated stitched Bouguer gravity and Total Magnetic Intensity grids covering three regions of Northern Australia. The data includes free-air gravity, terrain-corrected Bouguer gravity, Total Magnetic Intensity, and Reduction to the Pole grids for geological analysis. Processing used Geosoft Oasis montaj software and integrated satellite, ground, airborne, and shipborne survey data.

Use Cases

• Analyze Bouguer gravity anomaly grids to model subsurface density variations and geological structures across Northern Australia.
• Process Total Magnetic Intensity and Reduction to the Pole grids to identify magnetic basement structures and intra-sedimentary magnetic units.
• Compare free-air gravity anomaly images with terrain-corrected Bouguer data for first-pass interpretation and gravity modeling.
• Use stitched onshore-offshore grids to fill data gaps and create continuous geophysical maps for the North-West Shield, Northern Territory, and Queensland.

Strengths

• Data integrates multiple sources including satellite gravity (v27.1), topography (v19.1), and GA's ground and airborne surveys.
• Covers three defined geographical regions: North-West Shield Western Australia, Northern Territory, and Queensland.
• Provides standard datasets for geological analysis including free-air gravity, Bouguer gravity, Total Magnetic Intensity, and Reduction to the Pole grids.

Limitations

• Specific grid resolutions, row counts, and column counts are not provided in the input.
• Magnetic data coverage is limited to the North-West Shield Western Australia region only.
• Primary file formats are DOCX and ZIP, which may require specialized geophysical software for full analysis.

Provenance

Source

Geoscience Australia, Scripps Institution of Oceanography (SIO), NOAA, U.S. Navy, NGA.

Collection Method

Processed and stitched from satellite, ground, airborne, and shipborne surveys using Geosoft Oasis montaj software.

Time Range

Satellite data released 2019; survey dates unspecified.

Freshness

Satellite source data released in 2019; dataset record last updated 2026-03-07.

Geography

Northern Australia covering North-West Shield Western Australia (7–26° S, 110–130° E), Northern Territory (7–26° S, 125.5–141° E), Queensland (7–30° S, 135–160° E).