2019 B-Series De-trended Gravity Map of Australia

Australia is covered by a de-trended global isostatic residual gravity map derived from the 2019 B Series national gravity grids. The map combines approximately 1.4 million ground observations, 345,000 line km of airborne gravity, and 106,000 line km of gravity gradiometry data, sourced from government, industry, and research entities from the 1940s onward. It is presented as an HSI image with northwest shading and a linear color scale from -500 to +500 µm.s⁻².

Use Cases

• Detect subsurface density anomalies based on gravity residual data.
• Model geological structures and tectonic features based on gravity gradients.
• Integrate gravity data with other geophysical surveys for exploration targeting.
• Visualize regional gravity trends for educational or reference purposes.

Strengths

• Integrates a large volume of data: 1.4 million ground gravity observations.
• Combines multiple data sources: ground, airborne gravity, and gravity gradiometry totaling over 450,000 line km.
• Data collection spans a long temporal range, from the 1940s to 2019.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Data is provided only in PDF format, which may limit computational analysis.
• Freshness should be verified; the underlying data is from 2019.

Provenance

Source

Australian Ocean Data Network, based on Australian National Gravity Grids.

Collection Method

Combination of ground, airborne, and satellite-derived gravity data.

Time Range

Data acquired from the 1940s to September 2019.

Freshness

Last updated 2026-04-10 19:14:04.502129; underlying data from 2019.

Geography

Australia