National Gravity Compilation 2019: First Vertical Derivative Image of Australia

A 2019 compilation of gravity data for Australia and its continental margins, derived from nearly 1.4 million ground stations and marine observations. The grid has a cell size of approximately 435 meters and represents the first vertical derivative of de-trended global isostatic residual anomalies. Data were sourced from the Australian National Gravity Database and global marine grids, with ground observations collected by various entities from the 1940s onward.

Use Cases

• Model subsurface geological structures based on gravity anomaly data.
• Map density variations in the Earth's crust for mineral exploration.
• Interpret tectonic features based on processed isostatic residual anomalies.
• Integrate gravity data with other geophysical surveys for regional studies.

Strengths

• Derived from nearly 1.4 million gravity stations, providing dense spatial coverage.
• Ground observations span from the 1940s to 2019, offering a long temporal baseline.
• Station spacing in major parts of the continent is between 2.5 and 7 km, indicating detailed sampling.
• Processed and quality-checked by GA geophysicists to be fit-for-purpose.

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 compilation of historical surveys.

Provenance

Source

Australian Ocean Data Network, incorporating data from the Australian National Gravity Database and Scripps Institution of Oceanography/NOAA/NGA.

Collection Method

Ground and marine gravity observations processed via standard methods, including isostatic correction and Fast Fourier Transform.

Time Range

Ground observations from the 1940s to 2019, compiled as of September 2019.

Freshness

Last updated 2026-06-27 20:09:06.722293; freshness should be verified.

Geography

Australia and its continental margins.