Enhanced Gravity And Magnetic Grids For Northern Australia

Geoscience Australia generated gravity and magnetic anomaly grids covering Northern Australia, including the North-West Shield, Northern Territory, and Queensland. The data includes Free-air and Bouguer gravity anomalies, Total Magnetic Intensity, and Reduction to the Pole grids, processed using Geosoft Oasis montaj software. Satellite-derived gravity data from March 2019 was integrated with ground and airborne survey data.

Use Cases

• Map geological structures by analyzing Bouguer gravity anomaly grids for density contrasts.
• Identify magnetic basement depth and composition using Total Magnetic Intensity and Reduction to the Pole grids.
• Conduct first-pass resource exploration by interpreting Free-air gravity anomaly images.
• Model subsurface features by integrating stitched onshore-offshore Bouguer gravity grids with satellite data.

Strengths

• Covers three distinct regions: North-West Shield, Northern Territory, and Queensland.
• Integrates multiple data sources including satellite, ground, airborne, and shipborne surveys.
• Includes standard processed datasets like TMI, RTP, and terrain-corrected Bouguer anomalies.

Limitations

• Magnetic data is only available for the North-West Shield Western Australia region.
• Specific row counts, grid resolutions, and sample sizes are not provided.
• Data gaps in offshore regions were filled with derived satellite Bouguer grids.

Provenance

Source

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

Collection Method

Grids generated from stitched satellite, ground, airborne, and shipborne survey data using Geosoft Oasis montaj software.

Time Range

Satellite data released in early 2019.

Freshness

Satellite source data is from 2019, with a platform last updated date of 2026-04-04.

Geography

Northern Australia, spanning latitudes 7-30° S and longitudes 110-160° E.