National Gravity Compilation 2019: Tilt Image of Australia's Subsurface

A gravity anomaly grid derived from approximately 1.8 million ground and offshore gravity observations. The image is processed with a tilt filter and has a cell size of 0.00417 degrees (approximately 435 meters). Geoscience Australia and partner organizations compiled the data from the 1940s to September 2019.

Use Cases

• Modeling subsurface geological structures based on gravity anomaly data.
• Mapping continental crustal thickness and density variations based on processed Bouguer anomalies.
• Integrating gravity data with other geophysical surveys for mineral exploration based on the described station spacing.
• Correcting for terrain effects in geophysical models based on the described use of bathymetry and topography data.

Strengths

• Derived from nearly 1.4 million gravity stations from the Australian National Gravity Database.
• Data collection spans from the 1940s to 2019, providing a long-term historical record.
• Station spacing is described as varying from 11 km to less than 1 km, with major parts between 2.5 and 7 km.
• Processed with terrain corrections using offshore bathymetry and onshore topography.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and temporal bias inherent to the aggregation of historical surveys.

Provenance

Source

Geoscience Australia (GA), Australian National Gravity Database, supplemented with global data from Scripps Institution of Oceanography, NOAA, and NGA.

Collection Method

Ground observations acquired by government, industry, and research bodies, processed via standard geophysical methods and a tilt filter.

Time Range

1940s to September 2019.

Freshness

Last updated 2026-04-16 10:17:04.697797; freshness should be verified.

Geography

Australia and its continental margins.